I remain convinced that "find" also contains a text editor and a Pacman game, but I've never cared enough to read the damn enormous man page. Also, not every system has "find", but everything I've used has "du" and "grep".
The kernel could start 100 processes in the time it takes me to type those extra four characters. We won't run out of processes. I did a test, finding .txt files in /usr/share, it took about .25 seconds longer with du and grep, which seems like less than it takes to type 4 more characters.