Naa, quality of jump and rails should not make a lot difference, if you get good at your rusty rails back home, and then go to another resort witch have better rails, you really should have an advantage instead, also you should be better hitting urban, haha!
also jumps, good quality jumps would maybe save you from injuries, but they wont get you much better.. it's the size of the whole park that matters, and their lines!
If your shitty home park had a jump-line of 15 jumps in a row, you would have gotten more practice, witch means you would have gotten better!
people that live nearby big ski resorts, with big parks get thousands of more jumps and rails done in a season than people who live nearby smaller parks - they spend most of their day in the lift...