Not crazy But it's just my opinion.
Even though my lens and body arsenal is pretty good, 90% of the time I used my 70D and Sigma 18-250 OS MACRO on our recent trip to NYC and Florida. That is of course when I wasn't shooting birds...
I knew I wasn't going to print most (if any) of my casual vacation photos large, so the 70D + Sigma superzoom did a great job. Sharpness is pretty good, range is excellent, HSM AF is fast, OS is great, CA and distortion is fixed in post. The lens even performed well for videos that I shot. I found that when I'm on vacation and I'm not shooting something specific (like the Grand Canyon for awesome landscape shots), I constantly need a wide range of focal lengths. Wide for city architecture, then a quick zoom in for something in the distance. Then back to a wide shot, etc. I could carry 2 bodies and 2 lenses (or more) and alternate, but I just refuse to do that on my honeymoon, that's not the point of our trip. But like I said that's just me.
I did have my 6D and 24-105L with me also on both trips. But most of the time that combo stayed in the bag, unless my wife wanted something to shoot with.
The only critical shots on my trip were Florida birds and for that I was prepared with my Sigma 120-300 2.8 OS + various teleconverters. If I had been planning on shooting landscapes, I would have used better equipment for that too. But for Disney, walking around in Key West etc. I just went for convenience and compact size (for a DSLR rig) but still got more than decent quality. I'm very happy with my pictures.