I have an 02 X-star that fits in my standard 7' garage when tower is folded. I also have a bridge on the flowage I ride often that we need to fold the tower down to get under if we head to that part of the water.
Most garage door openers do not pull the door completely up at their default setting. You may be able to adjust your door opener to pull the door up higher. If it isn't the door and simply the boat being too tall for the opening, you could try to look into lowering the hitch point, either by using a drop hitch, or lowering the boat somewhat using the tongue jack.
Our tower is an OLD BareWest tower and it doesn't fold Its such a PITA to take it off every time we put it in the garage! One key thing we will look for in our next boat is a tower which can be lowered and still fit in the garage!