While I'm sure bhopping helps with this; you would be much better off spending your time learning air control in tf2. If it's jump maps, surf maps, whatever your ability to strafe and move in the air can actually be a really big factor in tf2. A lot of medics get the highlights of the "big surf" but even 6s classes like scout and demo, and HL classes like spy and sniper can surf to escape situations that they normally wouldn't. It's one of the more under appreciated skills at the top level of tf2 but it can prove to be very helpful