MPW (Macintosh Programmer's workshop) was pretty awesome, if slow as hell -- Turbo Pascal was a lot better to work with -- the only issue is that it 'tokenized' your source code, so it wasn't plaint text anymore...
I still miss these 'one pass' compilers; I think it peaked with MetroWerks toolchain (which kept a Pascal plugin for a long time!) that was IMO the best compiler/linker/debugger toolset ever made.