Are there "Tasks" Worth My Time?

I've honestly no idea, I've totally ignored all of them, as I do in every game that has collection tasks, the same way that I totally ignore achievements.

From what I can gather, completing them leads to some additional dialogue options, but I couldn't tell you what kind of dialogue options.

If I had to guess it would be something along the lines of: "Well done Pathfinder, now our knowledge of blah blah blah is greatly advanced, blah blah blah", but maybe I'm wrong.

I'm pretty sure you have to do them if you want 100% completion for the Heleus Cluster map - correct if I'm wrong.

there are a few very good , or interesting, but most are just boring

I don't go out of my way to do them but if I am in the area than sure why not?

Agreed with most that the "Additional Tasks" are just fetch quests with little or no value on the story. I ignored most. There are a few that are ok like the one where you meet with and develop a relationship with the reporter over the course of the game. But, that's it. Focus on Helius or Priority quests.

I will walk your andromedan dog if you put yor request inside the "tasks" directory.

Walk your dog in real life? who do you think i am? a pathfinder?

It is all subjective though. What the OP is looking for is story and interaction. Interaction you might not get, but at least for some quest-lines there are a few good mini stories to discover.

I honestly haven't really found a "Task" quest that I haven't enjoyed on some level. I mean, the "hitting rocks for science" and other "Scan 10 of X" quests I've kinda ignored, but most of what I've done has led to a fairly broad range of interesting content.

If you're looking for large, cinematic experiences, then these types of quests aren't for you, and can safely be ignored. But if you're into the idea of the Andromeda Initiative's exploration, finding out about your new "home" and/or learning about your new "neighbors," then you may very well enjoy much of the "filler" content.

Don't get me wrong, it is indeed filler content, and on some level I'd like to see the level of filler reduced for a few more "meatier" sidequests in the sequel, but every task I've done has had great world building aspects, personalization of NPC's we never see (the survey drone mission on Eos was fairly poignant, tbh) exploring the struggles of colonists before we arrived, some deeper insight into the time of the "revolt" on the Nexus, or whatever.

Taken separately and without context, they're simple tasks with little to no significance. Taken as part of a whole, however, I have yet to see a game integrate side content so well with the story and/or world building. Maybe with the exception of TW3, but I honestly just couldn't get myself to feel invested enough in Geralt get involved in that game for very long. Many of TW3's side "fetch" quests (that I played, since I didn't play much of the game) had no connection to the story or the world building, beyond go to this place of power, defeat this boss, and gain more abilities.

Yes, it's an unpopular opinion, and I'm sure there's some absolutely great side content in TW3 that I haven't seen, and I'm not gonna dispute that game's place at the top of the RPG elite, but I truly have enjoyed ME:A's side content more than any other game I've played. Again, I'd rather see a tightening up of the side content, remove maybe 30% of the "filler" stuff for a more fleshed out side-quest chain on each planet, but what we got has been very good to this point.

Most of them are worth because you are usually in the area for another quest anyway. I don't go out of my way to fetch but I usually end up completing most on my way to a monolith or something. Some of the scanning of tech and mineral stuff I have ignored bc they have no actual content/story.

I'm on narrative mode (it's basically God Mode), so grinding for xp isn't a factor. Admittedly, it's liberating. I enjoy combat in most other games, but for my first ME:A run I didn't feel like grinding. Everything is jumbled, especially the menu systems, tasks, and crafting. I just want to experience the story first. 

I think the 'tasks' can be divided into story based filler (ie. the angara/krogan 'love' story on elaaden) and scanning based filler (hitting rocks for science), though there is some cross over (the survey beacons on Eos is one of these, touching, but still just scanning).

The story based helps add to the world building, the scanning mostly just annoys me.