A bit of both
I'm trying to keep my miscellaneous quests down to a sensible number, which I decided was no more than could be displayed on a single page of the quest log.
So, I'll often have a session where I do two or three of the misc. quests, just to keep the number manageable.
And, of course, those quests are really good for when you don't have much time to play. Doing a radiant quest where you have to 'kill the leader of the bandits at X Cave' is something that can be started and finished in a short play session
I actually did a 'session' of misc quest last night. It's down to about a page in a half-2 pages. There was a time were there was alot more and I did your route and lit them all up and just went to the arrows to finish them off. Did a "power" play, I guess you can say. Its gettin to that point of startin to look for all the walls, masks, claws, treasures, critters, etc. Close to starting a new character. My Dunmer is at 47 and I want to get him to 50. That seems like a legit goal.
My side quest are basically DB/listener/radiant stuff. Although I didn't do the quest for the mage that told me where the Elder Scroll was in Blackreach (I got the Scroll, just forgot the other part)
I try to keep them down to a manageable amount and usually tackle a few during a play session. The thing is i find that while out adventuring completing these quests i invariably end up with the same amount of news as the ones I've just completed, it seems every second person and their mother needs help with something in skyrim.
I'm always aware of them, and take a look at them every time I open my journal. I often will do those random quests when I'm in the area, although sometimes I will actively persue it - especially if it is well suited for my character. Some of those quests I will never do (no suited for a particular character's personality).
I totally do the same thing. It's pretty surprising the number of times I've cleared a cave and then gotten a notification that I'd completed some task someone asked me to do, often one that I have no recollection of:P
I wish it wasn't that way I just really don't always feel like completing some of the boring misc quests I get but I also don't want to have to go back to the person to get them again, so I'm just collecting a kind of epic list of misc quests that I scan through every now and then to complete some, or as I mentioned earlier complete them without even meaning to :P It does kind of bother me though, takes away from the role playing realism of it all. I feel like there might be a session of misc quest clearing in my future.