I am the same way. When I read about someone complaining about TC/ESC causing them to lose control it makes me wonder what the outcome would have been had there been no intervention. However in this case the malfunction did infact appear completely on it's own according to the OP's description.
I have not had a customer car behave quite like the OP's but have had plenty of similar issues. Usually what happens with something like a wheelspeed sensor fault is the ABS tries pulsing the brakes no matter how light you touch the pedal. This causes a severe reduction in the amount of pressure the driver can put into the brakes and indeed makes for a very dangerous driving experience.
Can I pull a fuse so all electronic assist are off all the time?