Like you I find all of that a bit cringe, but there are people that go in for it and expect it.Reading all the replies it sounds like everyone quite reasonably expects the basics to be right - a working car without any defects, handed over without confusion, drama, or unecessary delay.
Anything above that it starts to get very subjective. Some people like the "special day" treatment and place value on it, some just don't. Personally, the whole covered car reveal + combination of flowers / mats / champagne / eternal gratitude, I find all those extras a little bit insincere and cringey. I'm happy with a working car efficiently delivered by someone who's happy to answer a couple of dumb questions without making me feel stupid.
And no - the Model X/£100k+ experience is no different. Why would it be? Would it not be even more egregious if Tesla reserved a fanfare for S/X customers but the 3 owners just got pointed towards their cars?