I noticed that completions/suggestions that IDEA is usually offering on many places through CtrlSpace or CtrlShift+Space doesn't actually work for annotations or enums.
I start to type @, and beginning of my annotation, and press metioned keys, and it doesn't filter available annotations.
When I want to iterate through enum values by live template 'iter', and when I point out to my enum instance, typing . (dot) afterwards, hoping it will find values() method in it, it simply doesn't...etc...
..some similar cases...