Actually spell check, has made me a better speller. Of course in the old days when the apple ][ dominated the personal computer space you had to save your word processing file, exit the word processor, switch floppy disks, start the spell checker, switch the disk for the dictionary disk, run against your file, approve/reject suggested changes, save the file, exit the spell checker, switch to the floppy disk with the word processor on it, start the word processor load your file, find the things the spell checker flagged as wrong but couldn't find a correct word for and fix those.

Seriously, it was just easier to get better at spelling.