While the heroes of the Harry Potter universe can use their magic to travel in a variety of ways we can't, that doesn't mean they're always comfortable. Getting from one place to another, even with magic, can be a bit of a nightmare. Even magically-enhanced vehicles have flaws. While some forms of Harry Potter transportation are better than others, even their best is not much better than our real-life versions.
Consider this: Harry Potter broomsticks seem cool from the outside, but unless you've got a good grip, you'll go tumbling right off. Flying cars can crash. And Harry Potter apparition, while convenient, can also make you leave bits and pieces of your body behind, a horrific process called "splinching." Leaving half an eyebrow behind, as Ron did in his apparition test, might not be so bad - but a faulty spell could mean you leave half of yourself behind, killing you.
Sure, wizard desserts might be great and it would be awesome to have magical powers, but taking a closer look at the average ways that wizards get around leaves much to be desired. Unless you want to ride a rickety minecart into the bowels of a bank, scrabble for grip on the back of a hippogriff, or end up sick and lost thanks to an unfortunate Floo Powder incident, it might be best just to play it safe and take the bus - the regular bus, that is, not the Knight Bus.
How it feels: Harry has to travel to Diagon Alley via Floo Powder in Harry Potter and the Chamber of Secrets, and it doesn't go well. According to Harry:
It felt as though he was being sucked down a giant drain. He seemed to be spinning very fast - the roaring in his ears was deafening - he tried to keep his eyes open but the whirl of green flames made him feel sick--something hard knocked his elbow and he tucked it in tightly, still spinning and spinning - how it felt as though cold hands were slapping his face - squinting through his glasses he saw a blurred stream of fireplaces and snatched glimpses of the rooms beyond--his bacon sandwiches were churning inside him - he closed his eyes again wishing it would stop, and then -
He fell, face forward, onto cold stone and felt the bridge of his glasses snap.
How it feels: Apparition is an incredibly useful skill, but it's also dangerous - Ron splinches himself multiple times, and even side-along apparition is quite unpleasant, as Harry discovers in Harry Potter and the Half-Blood Prince:
Harry felt Dumbledore's arm twist away from him and re-doubled his grip: the next thing he knew everything went black; he was pressed very hard from all directions; he could not breathe, there were iron bands tightening around his chest; his eyeballs were being forced back into his head; his ear-drums were being pushed deeper into his skull.
How it feels: Portkeys play a huge role in Harry Potter and the Goblet of Fire. Harry's first trip feels pretty awful, as Rowling writes:
Harry felt as though a hook behind his navel had been suddenly jerked irresistibly forward. His feet left the ground; he could feel Ron and Hermione on either side of him, their shoulders banging into his; they were all speeding forward in a howl of wind and swirling color; his forefinger was stuck to the boot as though it was pulling him magnetically onward...
How it feels: Harry takes the Knight Bus in a moment of desperation in Harry Potter and the Prisoner of Azkaban. During the ride, Rowling writes:
Harry wouldn't have been able to sleep even if he had been traveling on a bus that didn't keep banging loudly and jumping a hundred miles at a time. His stomach churned as he fell back to wondering what was going to happen to him, and whether the Dursleys had managed to get Aunt Marge off the ceiling yet.