That's exactly what I started doing. Like minds I guess. It is annoying but until we get the ability to uninstall the music app on the watch or they fix the bug introduced by the update, that's what I'm going to do.
I received the upgrade as well this morning and so far it looks like its not fixed. At 100% this morning and down to 52% and music is almost 30% of it. And the upgrade was done AFTER the charge to 100% which would have taken a bit of the battery.
I'll restart evertyhing tonight and check again tomorrow.
There is a way to disable the music app but it requires a few things such as connecting the watch to wifi, using a computer with Tizen Studio to connect the watch wirelessly through your laptop to run a terminal command to disable the music app.
My watch is at 69% in over 24 hours since I last charged it after I made the fix.