While the game has changed badly in some cases, such as the dependance of cash due to potential, some of the differences also depend on you. Idealizing your memories of the old game don't necessarily mean that the game was as good as you remember it. It doesn't help that when you first experience Maple it's all entirely new and interesting, there's so much to learn and to see. If you went back now you would already know everything. There would be nothing new to look forward to. If anything, that might make the old leveling format even slower than it was before.
I understand why you want some old aspects of the game back, but I feel like when you finally get it that it won't be as good as you remember.