I picked the half-decent vacation because I assumed iarwain1 was talking about forgetting the great vacation immediately (i.e. within hours) after it's over; if I had to take the pill several decades later I would have picked the great vacation.

(This means that how much an experience matters to me depends on how long I will remember it, rather than just on whether it ever happened at all and/or on whether I will remember it at t = +∞. Does this have some serious badly counterintuitive consequence that I'm missing?)