[racket] editing racket code effectively

Question for those who work in Racket on a day-to-day basis:

How can I edit Racket code more effectively?  To be more concrete, two 
speedbumps I'm hitting are:

- how to add temporary debugging statements
- how to temporarily comment out some code

I always seem to be fighting to make sure the parens are balanced, both 
in DrRacket and Vim.  I'm comfortable editing line-based languages 
(Java, Python, Ruby, etc.).  Should I structure my code to be more 
line-oriented (using more internal defines), or try to use sexp-based 
editing?

Thanks,
Dave