I have no idea, except my friend did his 25 and flew in all the gun positions, my guess would be that there is a big difference between going for a ride and trying to get a bead on a 109 or 190 when your life was on the line. His opinion was based on his experience over Germany, where your experience was based on a 20 minute pleasure flight.
Your guess is right on. I have a little over 300 hours in a B-17. Most of it in one of the pilot seats but also a fair amount of time in the nose, radio room, waist and tail. The B-17, like any airplane, is a smooth ride when the air is calm. Throw in some turbulence and the tail starts wagging around which would make it tuff on the waist gunners. (The wife was in the waist on a long leg and pee'd in a ziplock. As she was sealing the ziplock one of us bumped the rudder just enough to wiggle the tail, knocked her over with her flight suit still around her ankle, dumped the bag of yellow on herself --- interesting debrief after that flight.
Another occasion I was in the radio room as we did a ride for some paying pax. In the radio room with me were two WWII bomber vets and the handsomehunk up front decides to do a wingover. He did it gentle but even so both the old gents went to the floor when we got light over the top.)
Have a nervous pilot trying to maintain a tight formation and the ride is going to be rougher as he jockies the airplane around. Add some turbulence from the bomber groups ahead and it'll be even worse. Doing the Tico airshow we were following the B-24 with a couple B-25s behind us as we made racetracks with bomb bay open passes in front of the crowd, pyrotechnics going off under us as we passed. Mike worked his butt off that day with the climate induced turbulence from thermal activity combined with the wake of the B-24 and the occasional explosion under us. Moved us around quite a bit in the seats.
kvuo75, your ride was done without you having to wear fleece lined flying gear, bulky fleece boots and gloves or any armor. It's easy to do anything in t-shirt, shorts and running shoes.