That's the only thing? `find / -iname "hello"` doesn't do it for ya?
No, find is slow.
Locate, sure.
Both speed and GUI matters (to me). ANGRYsearch and FSearch come closest on Linux, but they're still far off and the upcoming Everything 1.5 (in alpha) widens the gap.
Author of FSearch here, is there anything in particular you're missing? But yes, there's a huge gap and it's probably never going away. There are many reasons for that. For one, Everything has been in development for quite some time now, and some things just can't be done on Linux. For example there's no MFT on Linux we could parse to quickly get a list of all files or an USN journal to keep track of modified files, hence building and maintaining the database will always be slower.
Not only, but single biggest. find won't do, but I'd be happy if either ANGRYsearch or FSearch one day reached feature parity with Everything.