I have been training for two years at my dojo and we do a lot of the connection stuff. Sometimes whole classes. I have to say that I am really grateful that my own teachers believe that even a 6th kyu can get something from learning this stuff early.
I am more sensitive to connection than a lot of people so to me the subject is endlessly fascinating and doing them for a solid hour is really very much ok with me. But I know that the majority of other students in the dojo feel the same way and while I see a couple who find it a little difficult and frustrating I can also see their sensitivity improving over the time they are with us. And it does make the technique better. Even if you can't quite see it's direct application just yet.
The other nice litle perk is when you go to a seminar with someone like Hiroshi Ikeda sensei you will be one of the ones who actually has a clue as to what he is doing. I've been in the situation at these seminars where I was working with someone, sometimes far senior to me, who had no real idea what it was we were supposed to be working on because they had so little experience with this kind of training.
Sometimes the workout you get in the dojo is more mental than physical. If you want to sweat and get a physical workout join a Gym or another martial art. Or grab one of your dojo mates and do some jyu waza before or after class.