I misspell words in Google searches all the time. I can either take the 3-5 seconds to correct it myself, or just hit search knowing that the big G will know exactly what I meant anyway. I would say an aspect of being "smart" is not wasting time on unimportant details?
I get that all those services are helpful to someone who's easily distracted, but I'm afraid using them is the last thing that's going to help your memory. It just makes you more dependent.
Personally I prefer not to use Google's auto-complete, I can spell just fine thank you. We're bloody human beings, we're supposed to be like the smartest thing on this planet, don't we?