Excluding certain files from a directory listing

Ok, well, this will be obvious to anyone who's really read the ls man page, but I only came across it a couple of days ago.

Say you have a directory with tons of files in it mostly with a single extension and you want to see what else is in there. Sure, you can use grep, but you can also use ls's inbuilt flat --hide.

> ls -l
arg.txt
blarg.txt
foo.txt
...
interesting.sh
... # and a ton more *.txt files
zlargyblorg.txt
> ls -l --hide=*.txt
interesting.sh
hidden.csv

Isn't that useful?