I would never drop RAF. Sometimes yes, I agree, I have way too many sites to constantly check and not enough time to check them, but what I normally do in those cases, is instead of dropping one, like RAF, I just keep all the E-mail notifications in my e-mail and when I do have the time, such as on my days off from work, I just go through all of them one-by-one, and then once I get caught up on those, I check to see if there's any interesting new posts, then I go silent until I have more time again. Or I'll respond to one or two posts during my down time.
That's normally what I do here. That's why there's 2 or 3 days in a row where I'm on almost 24/7, then like, 6 or 7 days in a row where you'll hardly see me, if at all. And I'd probably be on even during those times a lot more, if it wasn't for the fact that most everyone I talk to on here, I also have on Facebook, Twitter, and MSN, so I still keep in touch with them even during those times, so it doesn't even feel like I'm away for too long, cause I still keep in contact with most everyone off-site.