First, you really need to enjoy that type of experience.
A 3-star restaurant is going to have attentive, almost (but not quite) intrusive service. The servers come across more as dining consultants or even storytellers. One lunch at The French Laundry, our server spent quite a few minutes explaining the history of the butter served with the 'hot buttered rolls' course. The cow that provided the milk had been given to Thomas Keller as a gift, and now lived in upstate New York, eating plenty of clover (I don't recall the bovine's name). The butter was churned there, and then flown refrigerated to the restaurant in Yountville. Then, I commented about the case of aged whiskeys in the case behind our table, and in particular, a 1942 Scotch. A taste could be had for $1,200 per shot.
The courses are small servings, but seem to keep coming. There were almost as many dessert courses as main meal courses, and to be honest, when we were done, I was quite uncomfortable from the amount of food I ate.
The presentation is art, the flavors typically subtle and complex, and the quality of ingredients is clearly the best to be found. I ate dishes I'd never had before, not always sure what was in them, but could get the full back story by asking.
Lunch for four, $1,800, including wine.