I usually see Data.Map to imported as M, Text.ByteString as BS, etc. If you need more than a couple of these, I'd say it is a red flag and that the code needs to be split up.
It's in my experience much easier to avoid accidental namespace clashes with functions than with accessors (though some modules are intended to be imported qualified). If you need to model a real-world problem, you run into record namespace clashes very easily.
