I never think of rolls of film in a digital camera, unless I'm near the end of my memory card and have not backed it up, but need to go out to shoot. If the status reads: "only 50 shots left!!!", I do try to think of it as having a roll and half of film left, which helps me relax but also focus more on each shot.
But really, the two systems are so very different. You CAN overshoot in digital, then perform a first edit in a quiet cafe over lunch, and you bring yourself back down to the amount you probably would have shot with film... so the number of shots I actually take home are probably the same now with digital as a couple of rolls of film. Plus I no longer need to bracket difficult exposures (I use the histogram) or overshoot long timed exposures because I am no longer certain of reciprocity or the precise way in which motion will be portrayed on the film.
Having said all that, do I still take home more shots now with digital than I did with film?
Yes I do.
But what's the problem with that? I am still developing my style, and it gives me a lot of creative freedom. Shooting digital does not mean that I focus any less on each image. That is just a question of discipline - and as someone said earlier in the thread, lots of people used to burn through film.
I think a more pertinent question would be: "why did you limit yourself to only two rolls of film in the past"?