While I agree that it has its place, I'm opposed to over-reliance on muscle memory. I believe it restricts you to what you've drilled, even to the exclusion of very close neighbors.

But I'm also not trying to play extremely fast. If my goal was recital rather than composition, I would use it more. My recordings[1] are mostly total improv, free jazz, with a vocals track (later deleted) that states what chord changes are coming up, and then improvise over the first instrumental track while listening to the chord announcements.

https://soundcloud.com/jeffrey-benjamin-brown