I only use cold and I'm in Bournemouth, where the weather has been very kind to us (so far)!
Cleaning wise, I'm quite happy that I can get rid of snail trails, bird poo etc quite efficiently. And only using an Extreme brush.
I use Showa 282 Temres gloves to keep me pinkies warm.
My main hose is Gardiners reinforced pole hose which behaves itself quite well, I think the slightly thicker lining helps.
This year I have lagged all my van hoses and connectors and made a pump box, which is also partially insulated.
At night I drain most of the water from the reel, and cover reel and pump box with a duvet. Pole comes indoors.
So far so good, see how it goes.
I am actually quite happy with my cold setup.
Having said all that, my van is in a parking area, which is not near my girlfriend's house; I can't really run hoses or electric to the van.
If I had a drive and a garage I would probably fit an immersion heater, just to satisfy my own curiosity.