Yes, it's like driving a winnebago! But when you have 2 small ones, it really does make shopping easier. And they are such good helpers, I often take them with me even when I could leave them home with their older sister. Ok, I confess. I like their company!
I get a good workout when we are done - I push the full cart as fast as we can go out to the car - and I always park near the end of a row. I unload the groceries, and push them as fast as I can back up the hill to the store. They think it's great fun, and I get my blood pumping a bit! The other customers look at me funny, but I'm used to that. ;-)
Miss Fussy Rose, who is a tall 8 yo, is a bit cramped in the cart, but when I have her and 1 twin (a combo I'm not used to even tho it happens frequently), we still take the race car.