I saw a few minutes of a CoD1 speedrun and I saw the guy bhopping and wallstrafing, so I tried it in CoD2 as well. Not surprisingly, they were faster than straight-up walking. I made some videos to show just how much faster they are.

Pro: They are both faster (apparently) Cons: It is hard as hell to control bunnyhops, and there are few places where you can wallstrafe for a decent amount of time that I can think of.

Bunnyhopping:

Wallstrafing:

actually, I was hit by a grenade in the wall-strafing example and didn't notice until after I was done editing the video. oh well, it also feels faster anyway so I won't doubt this strat.