I use incremental-search (Ctl-r/Ctl-s) a lot in bash, and find it incredibly useful.
I noticed Meta-p (Esc p) runs non-incremental search, and I'm curious what purpose it serves, given the existence of it's incremental equivalent. Does it have some tricks up it's sleeve that I'm overlooking? Maybe it's faster if you're command history is absolutely enormous?
Since it doesn't give you the same interactive feedback you get from incremental search, I'm wondering why you'd use it.