I know a few families like this. And to a certain extent you're right. But I don't think it's because they're boring. It's almost always because they want reliability, comfort and relaxation. And as a couple of people have said, they often holiday with other families and it's a socialisation thing.
In many cases, they're also people who have "big" jobs with lots of stress and responsibility so the relaxation and reliability and comfort is a huge thing for them.
The ones I know are also very well travelled, but that's separate to their big familiy holidays. They've often travelled a lot when younger, both privately and for work, and then while their kids are relatively young, they revert to these easy, comfortable, relaxing holidays. But then it starts to get a bit different again as the kids get older - a city break in a new place etc.
But no, they're certainly not backpacking around India. They've either done it before when younger, visited for work or are not interested.
As a rule, DH and I aren't rushing back to the same places every time, but quite frankly, that's because while we have lovely holidays and I'm not complaining, we can't afford the kind of holiday that when we get there, it's "perfect". So we're always sort of looking for the next place that WILL be perfect. But realistically, unless our holiday budget gets bigger, that might not happen!