There's a lot of TV shows with good pacing, bad pacing, terrible pacing, and "Oh cool, that's fine" pacing. But yeah, even for a kids show like SU, pacing should at least be at a decently adequate level where even if you binged it from beginning to the latest episode in a good few sittings, you can still follow along. SU has bad pacing, and even if it was for adults, the amounts of filler, sidetracking, and necessity to tell every beach city, homeworlder, zoo human backstory is just badly timed. Kids won't know as long its a new episode. But the adults who actually make the show and/or allow it on the air are the ones truly making it. Plus, I'm certain kids barely watch the show, and its the adults that do anyway. Hence it lives in a world of StevenBombs and long hiatuses. XD The fact of the matter is the build your stories in advance. Some shows can get away with making stories later in the game (like Adventure Time), but others will either run into problems, or just flop entirely (Star Vs. is kinda in the former where it had some minor issues story-wise)
But if you want a show with GOOD pacing (both kids and adults, there's shows like:
Samurai Jack (although the final episode of Season 5 was a bit too fast and would have been better paced if it was made as a one-hour TV movie or so. Still good, but kinda too fast)
Dragon Ball, Dragon Ball Z, Dragon Ball Super (even though the pacing in those anime shows are on a whole 'nother level)
Star Trek The Original Series, Star Trek The Next Generation
Star Wars the Clone Wars (both the micro-series AND the 2008 CGI series that's finally getting a Season 7)
Spongebob Squarepants (tv specials and movies included)
Any Looney Tunes Cartoon (both classic shorts and modern works)
The Simpsons (for a majority of episodes, even some of the late-golden-age episodes like "Brick Like Me" or even the Movie for that matter)
Family Guy (despite the more bad jokes, need for shock value, and random stupidity, it still kept up the same fast-pace it had peaked during around Season 4)
One Piece (well, it's doing something right if its going to write 800+ episodes, holy crap....)
Disney's Ducktales (both the classic '80s cartoon, and the reboot)
Some, if not most, of the Marvel Cinematic Universe Movies (like the movies leading up the first Avengers, and movies leading up to Avengers: Infinity War)
Shrek and Shrek 2 (3 and 4 were a bit more slow.)
The Amazing World of Gumball (even with its random behavior, it works well)
Ed, Edd n Eddy (just the entire show all around.)
The Toy Story Movies have a balanced pace across all movies. Especially when you marathon all three movies at once.
And finally, Avatar The Last Airbender
Oh, and if we're gonna go further, some good Tapas works that have good pacing are ones like:
They might not be TV shows, but they all have good pacing that keep the stories together without getting sidetracked. The issue is that its a double edged sword with modern pacing. It's visible, and obvious... like severely obvious. But some people just don't care. It's good for the show if its a good show. But its also bad because its easy for other shows, comics, games, and movies to follow in a similar vein. But casual viewers won't care if other factors of a certain work still invests them. It doesn't matter what demographic that a series is for. What matters is how well the story is put together, and how it attracts viewers. It's possible to break pacing to allow for a small side-story, and sometimes its encouraged (like the episode of Avatar The Last Airbender where they had the small short stories like Toph trying to be a pretty girl, and Iroh singing on the anniversary of his dead son). But if you don't come back to your initial story, or don't have a initial story and are just mostly making things up as you go along, you're in for a deadly gamble. A high-risk, high-reward gamble, but a gamble nonetheless.
But who knows. They're all just stupid entertainment, right?