FWIW I avoid idioms like the above ever since I got bitten by the fact that globbing is a shell operation. Very few will notice, but I have been in the position of needing to do an emergency rewrite when I passed the maxium number of files in a directory that could be listed. (What that limit is depends on the shell Perl was built with. That time it was a bit over 3000.) While readdir() is much more verbose, with it I have no fears about being bitten again.

YMMV, warranty void where prohibited, etc.

UPDATE
jlp makes an excellent point below. I did not remember it, but once he said it I had a small bell go off. I had heard about that. Once 5.6.1 comes out I look forward to exploring what other goodness can be found therein.