I use points to stay in Aruba every year, you still get the same benefits just as if your were a paying customer. You are, Ina matter of speaking a paying customer because of yor loyalty. I've never been a gold, only platinum but I get upgraded every time. Resorts don't usually have concierge lounges. I stay usually at the renaissance ocean suites but have stayed at the Marriott club suites also. I have a great relationship with the folks at the renaissance and will stay there for that reason. The rooms need updated but between the folks and local shops, it's the place to go.
Are you staying at Stellaris Resort and Casino? if so, lounge access is not free regardless of your stays level...you must pay for it. We did so, and overall foundit to be worth it.
Having said that, I agree with the previous poster...we MUCH preferred the oceanfront Ren Suites because of the access to the private island and overall location.