Don't go swimming with it ... Unless you have an underwater case
Seriously I've had my entry level unanythingproof Rebel XTi out in the rain, in front of ocean waves, dropped in the mud, etc., still going strong after 7 years. The 6D has been dropped off a tripod at least once, kept in the underbelly of my X6M for weeks at a time in Florida heat and humidity, rained on, etc. No issues yet!
Just keep a cloth with you to wipe down excess water off of the buttons if you get caught in the rain with it. I would do that regardless of the camera.
These things are more durable than we give them credit for... The weather sealing is for extreme conditions that most people won't likely ever encounter, unless you're a journalist shooting in the middle of a monsoon or something. Even then there are as Mark mentioned rain sleeves available.
Btw, if money isn't an issue get a 1DX, best of all worlds
But when is money not an issue, seriously, for most people at some level... I would love a medium format digital kit, if money wasn't an issue!