I'm too cheap to buy Lake shoes. So I just wear big waffle stomper high top hunting boots, extra large with two pair of socks and platform pedals.

I'm currently experimenting with staying in my regular shoes but adding some DIY electric warmers under the sole, both feet powered from a 7.4v lighting battery. My first version is drawing about 3 watts per side, and it absolutely helped - my toes were a bit chilly but given the temps without it they would have been painfully cold. I think for a 2nd version I will probably go to 5 watts per side. That's still only about 1.2 amps total draw so a Magicshine battery will keep my toes toasty for 2 or 3 hours.

Maybe not practical, but it's fun to experiment.

I don't bother when it's warmer, over about 20*F just regular mountain bike shoes and warm socks is good enough.