I tried to use it recently for a big app at work. All the *real* work is packaged up in modules, but for the webby front-end I thought CGI::Application would help. It didn't. All it did was irritate me, so before I got too far, I threw it away, and turned my code into one really big
if ... elsif ... elsif ... else. It works. It makes sense.
And it's only big because each block consists of stitching together a big data structure by calling a load of object methods (and these are BIG structures, for complex pages) which is then passed to TT. There's not all that many statements in there.