I personally like the faster pace.
I agree that calculations give you a good edge, and you shouldn't be snap calling. But It drives me crazy when you have the same player taking all day every hand. You don't need all day. You know what you have and if it is good or not within a few seconds. If you need to run numbers on every hand, you are trying to play something other than poker. I mean how hard is it to quickly figure your numbers close enough to raise, call, or get out of the way.
As the game progresses, you already know how many players where dealt to. (That changes only occasionally as they are dropped out or added to the table, not every hand). You know how many people are still in the hand and should already have a very good idea of how many outs you have. (You can memorize these numbers) so that leaves you with
pot odds and implied odds. How long does that take to keep track as the pot grows.
Sorry, this sounds more harsh than intended.