Good question. So I took a look around my kitchen at home to see what I use:
Kitchen Aid - saves time but not essential.
Cuisinart - again, a great time saver but not essential.
Mr Coffee spice grinder - I guess I could pulverize with a chef knife.
Garlic press - again, chef knife can do the job.
Egg Slicer - chef knife.
Bench Scraper - chef knife (upside down.)
Gram Scale - OK I could just do the math and use measuring cups.
Measuring cups - OK a palmfull of this a fistfull of that, a pinch here an eyeball there.
Offset Spatula - chef knife (again! Dang this knife is useful!)
Microplane Grater - dare I say it again...chef knife
Box Grater - chef knife.
Beer Bottle Opener (Church Key) -
piece of paper,
ball point pen...Chef Knife!
Can Opener - No, not my chef knife. I don't know, I guess I can't live without it.
Living where it is below freezing for most of winter, canned tomatoes are essential.
CAN OPENER!