About a year ago, I upgraded from a 96 Neon to an 05 Elantra. I felt like King Shit for quite a while, but now it's just my car, nothing overly special. Same thing for the 08 Accord that my wife has. These things speak to how fast we adapt. Even those who win lotteries eventually go back to the level of happiness they had before. Is this good or bad? It's hard to say, but such is life. It's quite possible that we adapt more slowly to losing things than we do to gaining them. I know it took me a great deal of time to get over the loss of my first dog. When a long-term relationship ends, it can take an incredible amount of time for one to gain true acceptance.
In sum, I'd say it's best not to jump to conclusions that you'll be forever happy if you obtain this or that.
It may make you feel that way for a time, but it's not gonna last. Like the best orgasm, it will be over before you know it. Best to enjoy what you have and leave it at that.