Rarely do I make a drawer deeper than 3". Much better to make more shallow drawers, especially for tools. My 17 drawer tool cabinet has a deep drawer for power tools and one for planes, and a few mid depth for hardware etc, but most are 2" to 3" deep for everything else. My desk has 11 drawers, 3 of mid depth and one deep, 7 are shallow.
Clothing drawers are the exception.