Same here, except in my case I've noticed another problem: the more games I have, the more trouble I have even *wanting* to play games because the sheer amount of choices is so overwhelming.
It's like, on my PSP where I only have nine or so games, its easy for me to choose something to play at a moment's notice. But on my NES, where I have forty games, I often don't even put a cartridge in because I can't make up my mind. Moreover, if I decide to play an old favorite like Kirby's Adventure which I've beaten millions of times, I feel bad because I have a copy of Adventure Island II that I've never beaten and only played for a few hours when I first got it. My mind tells me I should be playing the latter, but I actually want to play the former.
That's partly why I went CIB-only too--it helps limit my choices.