It's called technological advancement. :shrug:
What did people do before there were cars? They walked.
What did people do before there were planes? They drove.
Now people don't have to go all the way across a park just to find out the ride they want to go on has a crazy-long wait they're not willing to do. Or they can find out the wait is quite reasonable and make their way there when they might not have otherwise.
Just because it's new doesn't make it bad. In fact, this may help people get more rides in while there in the parks by managing which rides they choose based on wait times instead of standing in the nearest queue no matter how long its wait might be.
And if I understand correctly, the app is GPS based and gives you wait times for the park you're in or nearest, so from BW you likely wouldn't be able to find out the wait time for Splash Mountain beyond the "See Now", "Moderate" or "High Demand" that's available from further away.
~~Luddites were wrong~~