Slide protecting in the Passing game

I know this is something that is commonly discussed in relation to the running game, but isn't mentioned a lot in the passing game. I personally barely use it at all in the passing game becaue I feel like if you gear your line a certain way, that only leaves another area vulnerable. I was just curious if people had a certain method for using it though.

I only do it on rollouts, and if it looks like they're blitzing to the vulnerable spot I usually undo it.