Overall service occasionally declines a bit here or there, sometimes down to one person not holding the standards themselves, sometimes because of things like Covid downsizing, staff shortages, etc. But even when it's not excellent, I still never had a bad experience with Disney service. The worst I noticed would be a housekeeping staff member not saying hello or welcome as I pass them in the halls (most do), or a request for a fix or replacement of something in the room taking longer than usual (most of the time, it's within an hour - a rare few times it took a day). I've never felt the level of service to be less than when staying on cash - in fact, much of the time I find it to be friendlier.
I tend to be a very happy, positive, and outgoing person - so I hit the front desk with a smile, talk about my hometown,
DVC, my long Disney experience, etc. If I see a cast member's tag is from someplace I know, or have visited, I'll mention it. If I make a request and they're trying to accommodate it, apologizing for a little extra delay while they try to meet my request, I tell them no problem - just happy to be at Disney World instead of the office. I always say hi to all cast members I pass in the halls, including housekeeping, who are almost always friendly and say hi or welcome home. I try to make a point of bumping into my housekeeping staff the first day or so and let them know I tend to be a late riser - that I generally won't be leaving my room until 11:30-1pm as I'll hang around, have breakfast, etc. A vast majority of the time, I get back the same friendly and happy vibes from employees and service staff.
On a rare occasion if I get a cast member or staff with a real bad attitude, who is really presenting a bad image for Disney employees, I will mention it to management. Everyone can have a bad day, and maybe be a little less friendly, but at Disney, there's never a time where it's OK to argue with guests, deny them service, or be rude.
I've even traveled once with a family friend whose wife was a very unpatient person who often boiled over at the slightest deviation from perfect expectations - and despite her attitude and outbursts, cast members stayed very friendly and level-headed - they are usually well trained to handle guests who are not in a good mood. Only on a very rare occasion did she come across a housekeeping staff who was likely not having a good day or was in a mood herself, and she got a little sarcastic back, which launched my friend's wife into the red zone, and the housekeeper ended up walking off and ignoring her request. A call to the front desk immediately resolved the issue with a housekeeping manager coming by to handle the issue and apologize, even offering a voucher for $100 (I was a bit embarrassed by it all as I felt like our party was very much equally to blame at the least). Even in a nasty confrontation, Disney defused the situation and the wife even felt smug in getting what she wanted and scoring free money.