I don't mean to go on, but... You can *hear* whether a record is too fast or slow. You don't have to know in advance. Also: cueing up is *faster* when you get used to not touching the records. Try it. If anything, pitch mixing means you have more control over records and therefore don't have to worry about, say, disco records that speed up at a chorus: you accurately compensate as it happens.
I'll say it again: try it. I don't touch records in the mix, and I don't organise my records by bpm or front -> back (I'm not sure what that means but I think you mean programming out a set in advance), and believe it or not, can mix records I've never heard before: I buy new ones after all. And it is much easier doing this by using the pitch control. > Depends a little bit on the amount of time you've got to get the mix in, and > whether or not the target track is being thrown out to into the open, or > whether it's only in your cans. Pitch mixing also means you've got to know > your tracks very well, OR (I emphasise or) that you've cheated in some way > (front->back box, or BPM's on labels). > > Horses for courses as they say. ;)