I'd have to agree about the WinUAE interface being slightly illogic and cumbersome. I really like the way the Atari ST emulators STeem and Saint (the simplest) are designed. I guess it'd be simple enough for a programmer to knock up a nice looking frontend for WinUAE for people who just want to load games and demos.
Whatever happened to WinFellow? I thought it was a promising alternative to WinAUE, a easy to use game/demo emulator.