Interesting discussion!
I would say it is a definite yes if you are staying 30 nights, and can get to 60 nights via other means (cc spend).
I would argue that families that travel primarily to luxury resorts get the most value from Globalist status. Much more so than the average business traveler.
We are a family of four and travel exclusively to family resorts. We stay at resorts around 40 nights a year during school breaks, and get the remaining 20 via credit card, mattress runs, and promotions. I would estimate the value we get from Globalist status is $10,000 - $20,000 each year.
Our bill for breakfast for 4 at most resorts is regularly $150+ including tax and gratuity. Multiply that by 40 nights and it comes to several thousand dollars in value from breakfast alone.
If you can maximize the SUA for 7 nights at resorts that could be another $5,000+ in value, and having a suite as a family is so nice! I have already applied my 4 SUA's and I am getting $6,328 value from them. That doesn't include any further upgrades beyond the standard suite, and other upgrades where I don't use a SUA. Here is where I am using my SUAs:
PH St. Kitts 7 nights $2,640
Andaz Mayakoba 7 nights $1,837
Rancho Pescadero 3 nights $1,358
HR Cartagena 6 nights $493
You will have to plan your vacations around Hyatt resorts. But you could probably do 5 years worth of vacations in the N. America region without visiting places twice.
Also, once your kids are older, the resorts with Kids Clubs are priceless!