Yes, unless the executable is compressed in some form (data sections are unpacked in memory while running), but this is unlikely.Are you sure that an executable would contain literal names of struct members ? (cool website btw )
Take the exe file you send me and open it in notepad or use string2 tool. You will find all methods names and all parameters you extracted using IDA.
So in some structures you should find names stuff like "nextsection" "radius" "junction", "x", "y", "z", i expect to find these but did not see anything like this (and also nothing that would looks like structure members)
What is in MacOSX version is probably to debug (step by step) or to produce a stack trace if i something goes wrong at runtime (so you can easily find what goes wrong)
I think they forget to do a strip (not enabled by default): http://linux.about.com/library/cmd/blcmdl1_strip.htm
http://en.wikipedia.org/wiki/Symbol_table