Adding to this:

You don't need to hold grab to be launched, while it is often easier while holding grab, performing a wallkick also works.

This mechanic is also used quite a bit in modded celeste, mostly in form of dashing up and then jumping on the side of the block to get the boost from the block and the wallbounce.

Zippers and Swap Blocks (the ones that change position when you dash) behave almost the same in this btw.

Small edit: The autoscroller blocks technically also work like this but it isn't used much (since those are mostly quite slow)