Many people do a long slide into a wall bounce, but it is actually possible to do a "No slide" wall bounce. The way you do this is by doing a slide jump so fast, that it actually looks like you don't slide. To do this, press your slide/crouch input while running and then press jump really quickly after.

Somebody who abuses the hell out of this is stormen. The clip shows him wall bouncing everywhere without even needing to slide. He uses this technique to wall bounce really smoothly. All it takes is a bit of practice and you should be able to wall bounce just like him!