@stebo02 no, never had that problem so far, they've stayed healthy weights, but I think it might depend on the cat.
With my cat I had as a kitten we had a policy of cat biscuits and water in her bowls 24/7 so she could snack whenever. Because she was brought up with that setup, she was really casual about it and never overate. It was only at mealtimes she miaowed for wet food.
Come to think of it I did the same for my old rescue after a while but when she got super old she wanted soft/wet snacks a lot. With old cats the challenge is keeping the weight on them.