I got sick of typing URLs for members and so, well, I coded.
To provide a link to another member just use the tried and true @username syntax, where the username is the username generated from their name (or manually modified) in the form first-last. Everyone's profile shows the username just under their profile image.
So if I want to shout out to a ray of sunshine I can just go @Michael-Martin (no link - just type that literally) and when the message is saved the link is generated.
Obviously this is opening a can of worms and I know the next two requests. Yes, soon.