This does not answer your question directly about the Ireland tour, but I can share my experience with the Heart of France Tour if it helps you get a better idea of the experience.
Dining: We had a few group dinners, but many times were on our own to find the small places you speak of. When we did have group dinners, most of the time we had the entire restaurant to ourselves. So they were not large commercial places where we ordered off a menu, but smallish local experiences curated just for our group.
Tour stops: As far as arriving outside of normal “tourist” hours, not necessarily. An exception was our overnight stay at Mt St Michele, where we arrived as everyone else was leaving. We had quiet streets, a private dinner, and an early morning tour before the next crowds arrived…so memorable! I really don’t remember feeling overcrowded at any site, though. We traveled in September, so perhaps be careful about which tour dates you choose…pick a “shoulder season” week rather than a peak season one if you are worried, just as you might if you went as an independent traveler.
But there were other advantages to traveling with a group. “We’re going to the Louvre. Do I have to navigate the subway on my own? Nope here’s your ride ticket, follow me. And now we’ve arrived…here’s your skip the line ticket…enjoy your visit.” “We’re going to Normandy…just get in the bus…we have arranged for one of the best guides in the area to lead us around and give you all the history between stops. And you don’t have to navigate anything on your own.” To my husband, this was a true VACATION.
Invaluable insights: In addition to convenience and ease, the guides give you so much information on the history of what you are seeing, and even the French way of life. IMO, nothing beats “traveling with a local.” And the tour may arrange some cool experiences you wouldn’t get to do in your own, such as our wine and cheese tasting under a giant old tree at a vineyard.
I know I sound a bit like a salesman. Actually, I don’t think a tour is for EVERY trip (for instance, we will do London on our own.) But we covered a LOT of area in France without driving or having to arrange and research everything on our own. You won’t know if it’s for you until you try it. And seven days seems like a short commitment of time to find out.
Edited to add: don’t forget to plan on some extra days on your own before and/or after your tour. We went to Paris three days early and went to some places not covered on the tour (and had time to adjust for jet lag before the tour started.) For instance, with the Heart of Ireland tour and flying into the Shannon airport, I would suggest a couple of days in Galway and/or an overnight on an Aran island before meeting the tour in Ennis.)