Command-left and command-right are no better. In text fields, they mean 'go to the beginning of the line' and 'go to the end of the line' respectively. This is a bog-standard Mac UI convention they're overriding, replacing a little thing (text cursor placement) with a medium thing that can have negative consequences (web navigation, possible loss of form data).
Just this morning, I lost substantial work to this mind-bogglingly stupid UI decision. I felt like Strongbad in SBE: Sisters. I've freaking had it with this dumb 'shortcut'. If necessary, I'll even switch to Firefox.
I'd rather not. Give me a way to get rid of the minefield on my keyboard.