I upgraded from a 21ft to my current trailer which is a little over 35ft. I can certainly feel the weight difference but not necessarily the length. When driving down the road it feels very much the same as the shorter trailer in terms of length. You have to be more watchful when making a turn but overall it's not too bad.
My biggest obstacle was turning into my yard. I have a slight incline into my yard where I store the camper. The shorter 21ft camper made the turn with no problems. The new camper would drag the back end on the road so I had to regrade my entrance. Now I don't drag but it does get close to the ground in the back. That is honestly the only place I've had a problem with the added length.
I love the length when it's raining and everyone is inside. I camp with a group of people and we often hang out in my camper after dinner. Even with 10 people in there we still have room to move around. Again, the length is not as much of an issue as the weight. Make sure you have a vehicle that is capable of handling the weight and add a good hitch and you'll be all set. My Excursion handles the weight pretty well.
2001 Ford Excursion 6.8L V10 Limited
2012 Sabre 32QBTS
Dear wife, three sons and one dog