There is WAY more to the "no grumps" policy. Nobody really has a problem with carrying their bags or what time the bus leaves.
First let me say that I have taken a Trafalgar and a Globus tour and I preferred the Rick Steves tour. That being said, the RS tours fall short in many areas. If this is the best of the guided tours, then I much prefer to travel on my own.
You will know when something is coming up that you will not like because there will be a pre-emptive "nobody ever has a problem with this" speech. Since you will be the first person in the history of travel who has a problem with it, you are a grump. Our guide even said "you get what you get and you don't throw a fit". This was said in a joking manner, but you could tell they really meant it. The only problem with that is that we are not in kindergarten and we are paying over $5,000 per person.
You will be staying in 2 star hotels. Slightly lower than a Days Inn quality. If you have been to Europe before and you know that they have better hotels and better breakfasts than what you get on this tour, you will not buy the party line of "this is what their hotels are like" and "this is what their breakfasts are like". I think they could afford to stay in better hotels, but that is not really my problem. My problem is that they lie about it and rely on the fact that most group members have not traveled to Europe before and do not know better. I guess this makes me a grump.
You are supposed to stay in small, family run, centrally located, memorable hotels. If that were true I would be willing to give up some comfort or convenience. The hotel in Haarlem, Rothenburg, and Beaune were all that and I enjoyed them very much. Most of the others were subpar. The hotel in Switzerland was the worst. It was in the middle of nowhere. There was not one other thing to do for miles. Yes the land there was pretty, but it was just as pretty in nearby towns that had more to offer. Anything to offer.
They say you are traveling "like a temporary European". The only problem with that is that we lived there for 5 years so we know better.
A few more specifics:
No AC and no fan. No AC is fine, but at least give me a fan.
Many breakfasts will be terrible. Bread and bad coffee.
You may share a bathroom with 6 other rooms. This is a bit much.
The age restrictions will be completely ignored. You may have children of all ages on your tour.
The assistant guide may stand in the front and block your view even though she has been to this place dozens of times. But when you have a question about this same place the answer will be to ask the lead guide.
Your guided tours, often complete with showing you pictures out of a book, will take up most of your time and you will have only a few minutes to explore on your own. If you want to spend 10-15 minutes each on only a few pieces, you are in luck. If the 4 pieces they choose to stop and show you are not what you were hoping to see, then you are not in luck and you may be a grump. At the Ufizzi Gallery we had 10 minutes on our own and at the Colosseum we had 15 minutes. I think they should tell you at the beginning what the schedule will be so you can choose whether you want to go on the guided tour or explore on your own. After the first couple of tours we started exploring on your own, and to the guide's credit, he facilitated this for us and did not treat us like grumps for wanting to break away.
I hate to be a grump, ok I don't really, but in my opinion "no grumps" = "be a sheep".