On our first cruise we splurged, assuming it would be our only one, and got a 2br suite for our family of five (7 night Mexico). It was pricey, but nowhere near what it prices out at right now. It was ideal for us, and our room host pointed out at the time that it would spoil us and making stepping down to a smaller cabin difficult. She was right: we were spoiled and stepping down was hard. But the cost now is just not justifiable, especially since the kids are older, don’t need mid-day naps, and we spend so little time in our cabin.
That said, with a party of 6 (and young kids) and a desire to keep you all in one cabin, I can see the benefits of a suite. The cost is just a huge hurdle.
An addendum: just for the heck of it I just checked the price of a 2br suite on the same 7 night Mexico. 6 years ago it was $8500 for our family of 5. The price now for it (using the ages of our kids then) is $18,500. That’s a $10k increase in 6 years - 115% more! That’s rather shocking.