Probably the biggest single speed boost you can get in the game is due to a “reflected” wall hop. These get you higher and further than wall hops used to scale straight up the same wall you wall hopped off.
Although reflects can occur using the SMART button (when in air and next to a wall, pull the left stick away from the wall while holding SMART), chances are, you’ll want to use this all over the place to keep your speed up, and put yourself into the air manually (jump), rather than waiting for the few occurrences where there’s a drop with a wall at the side.
So yes, doing things semi-manually will get you there faster.
On console, wall hops give a temporary turning bonus away from the wall so that grabbing ledges behind you is possible i.e. you can jump into a north facing wall, wall hop, and turn to grab the ledge of a south facing wall.
Also, there’s nothing like closing in on a heavy by wall hopping into melee.
Oh, and sliding, if I recall correctly, inherits your current velocity, so wall hopping into a slide is a pretty good speed boost tool.
Ramming speed!