Yes, you had a great experience, but it was not the same experience. Just a few differences:
1.) Depending on the state you came from, you may have had to quarantine upon return, take a Covid test, or both.
2.) You had temperature checks, where you could be denied entry into the Park, restaurants, and even Disney Springs as a whole. While you wouldn't be forced to quarantine, what are you going to do?
3.) You had to wear masks everywhere (even outdoors) with limited exceptions, which is actually more restrictive than many state regulations. Until recently, you even had to wear masks when getting your photos taken.
4.) You had to make reservations to enter a park.
5.) No park hopping.
6.) Limited capacity for sit-down restaurants, and choices overall for restaurants.
7.) Severely limited live entertainment options (e.g., no fireworks, no night shows, no large parades, no character photo ops, no live shows, etc.)
8.) Very limited hours.
9.) No fast passes.
Yet, despite all those restrictions and limitations, you had a blast.
As for the new UK cruise:
1.) Vaccine - if you have a vaccine already, you're not really worried about getting the vaccine. If you haven't, well, yes you may stress and you may cancel. But there will be a significant portion of the population that will have the vaccine (especially towards the end of summer).
2.) Covid tests - this is similar to temperature checks at WDW as you may be denied entry if you have a high temperature.
3.) Quarantine in room - At WDW they didn't quarantine you, but you did have limited options on what you could do. You can't enter Disney Springs, you can't enter the parks, and you can't enter restaurants. I suppose you could go to the hotel shop, or the pool, but your options for other activities are otherwise severely limited. Of course, your chances of being quarantined are much less than at WDW if the crew is all vaccinated, and everyone on the ship is vaccinated (save for children) and everyone has a Covid test.
4.) New activities. Disney said they are going to do some new activities, and I believe them. At WDW, yes, they did get rid of a lot of benefits, but out of that, they had random character greetings, some ridiculously short waits, new parades (well cavalcades), and just a new way to see WDW. Crowds were severely reduced for that time of the year.
I think people will still have fun, despite the restrictions and limitations - so long as they are not expecting the same experience Pre-Covid and have an open mind.