One response to this is to plan your own changes in experience: given that you'll enjoy but then adapt quickly to improvements, you can increase your enjoyment over time by alternating between simple and indulgent lifestyles, with simplicity being the ice-water to complement the ice cream.

In a similar vein, another recommendation is to favor differential experiences over static improvements, e.g. traveling rather than buying a nicer car. Your expectation of enjoyment from the car is overestimated because you consider the enjoyment relative to your current state, discounting your own adjustment once you have it, while travel is continually changing by definition, both with your departure and your return.

Interesting subject, hacking your own enjoyment of life.