I'm not a big one for finishing games either - same reason: life intervenes.
That said, BG2 wasn't actually a *huge* time commitment. You can zip through it pretty quickly or dawdle, explore everything, and make it into something huge (although still, from what I've heard, much smaller than many other games out now). I really did like BG2 more than BG1 - precisely because of this sort of openness.*
*That, and I got to have my very own thieves guild. Which was pretty awesome.