Just to add some more confusion, you forgot about seat tube angle. I find the seat tube angle to be very important for comfort. I say it is more important than top tube length, within reason. Take two bikes, your hybrid and a race bike set up exactly the same. The hybrid will have much less weight on your hands because of a more relaxed seat tube angle. This is one reason I will never own a LHT, because in my size, the seat tube angle is way too steep.

What I'm trying to say is that just because the top tube length is the same, does not mean that two bikes will have the same comfort level. There are many things that decide this, seat tube angle, top tube length, head tube length, handle bar height, etc. Also, how the bike is ridden will change how the geometry affects comfort, what is good for a race bike will not be good for a hybrid. You can get an aggressive riding position with little weight on your hands and you can have an upright position with lots of weight on your hands.

As for disk brakes, don't worry about taking the wheel off on putting it on. It really is no harder than any other braking system. Once you learn how to adjust disk brakes, you will find it very easy. This is especially true if you have good brakes, like the BB-7s. I think they are easier to adjust than any other type of brake. The only "hard" thing is truing the disk. But with some practice and a white piece of paper you will find this is easy also, easier than truing a wheel.

If you like the feel of the Vaya, get it and learn how to adjust the brakes. You'll like them.