If you're talking about Opera on Windows, I can't say as I don't use it often enough to notice. I certainly haven't had to relearn how to use Opera on Windows.
On Linux, text looks fine to me. You must mean something different by "controls" than I do, or use the browser in a more complicated way. Back, forward, fast forward and fast rewind, redraw, Home, End, zoom out and in, all seem the same to me.