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Yes (Score:1)
You can indeed reach a level where the code density is too high: consider APL or Forth. With APL, even if you didn't have the bizarro-planet character set, and a ton of comments, each line could take a couple of hours to read and understand.
I've never had to debug a "production" APL program (not sure one exists ;-) but I would approach it with the same trepidation as having to debug old Fortran code. I would have the same worry about figuring out exactly what the code is doing, but coming from opposite