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To me, the Battle Frontier has always been one of the best features in Pokemon. You have different kinds of facilities that have their own gimmick on how battling will go for you. You can go to the Battle Tower and do some nice, traditional battling, but if you want more or if you're tired of plain old battling, you can try out the other facilities. With all of these different facilities, the game encourages you to try out all kinds of Pokemon and build competitive strategies to ensure victory.
It also helps that not only is the Battle Frontier all something we love doing in the Pokemon games, but it also helps that it's in the post-game. Feel like playing the games again, but only for battling? Go to the Battle Frontier. Want to try out new Pokemon and use them in different teams and strategies? Go to the Battle Frontier. The Battle Maison/Tree are fun too, but sometimes I want to do more than just Battle Tower-esque battling all the time.
The Battle Frontier has been designed specifically for players who are passionate about battling, and it shows how much effort GF poured into it. It's hard collecting all of the Golden Symbols/Prints, but not impossible. And when you manage to collect them all, it feels just so satisfying.