Suggestions without patches are extremely useful when someone gives you a use case that may be common but which you wouldn't have thought about because it's outside your own personal work flow.
Software I write for customers always has a "Suggest a Feature" button somewhere on the primary nav.
Some of the stuff suggested is ridiculous or impossible but sometimes they suggest stuff that in hindsight would have been blindingly obvious but I'm not the end user no matter how hard I try to put myself in their shoes.
