1. Metric / imperial conversions, especially in the kitchen - this is one feature that is miles better than using a phone or computer if my hands are dirty cooking something and I want to know how many grams 12 ounces is or something like that.
2. Intercom between my 2 google homes, one in my kitchen and one in our converted attic playroom - it's so much nicer to use Google home to call my kids down for dinner vs. screaming up two flights of stairs.
3. Making quick phone calls
4. Finding my phone - I lose my phone constantly, and it's super handy that I can get my google home to make it ring even if it's on silent.