This episode features Alec Baldwin as Phoebe's date Parker, an enthusiastic guy whose zest for life proves to be too much for the Friends.
Alec Baldwin is really the cornerstone of this episode. He plays the role of the overly-"zesty" Parker perfectly. Guest stars like Baldwin are one of the reasons Friends is/was such a good show.
Additionally, Rachel and Ross have to pretend that they are married, since Judy and Jack have told their friends that they got married because Rachel is pregnant. Rachel's fake wedding scenario is so hilariously overblown and Ross's proposal is touching, even though it's not real.
Overall, it's one of the funniest episodes of the series. Maybe it's not quite Santa Claus on Prozac at Disneyland getting l**d, but it's so fun to watch.