I suppose signing up for Twitter is 1 step easier than Mastodon, because you just go to the one site. But it's actually incredibly hard to use and find value from; I suppose people have forgotten this because the small percentage of the Internet who liked Twitter figured it out 10 years ago and it seems "normal" now. The good news is, that'll make Mastodon fairly easy to use, too, since many conventions are similar, though Mastodon is easier in some ways. I am not a regular user of Mastodon but I already find it somewhat easier.
I attempted to derive value from Twitter on and off for, whatever, 10 years, and I still found it incredibly hard to use. I'm not a stupid person; obviously if I had a real reason to get used to it, I would have. Journalists, for example, "had to" use it, because they found it an incredibly easy shortcut to getting opinions from a populace that they assumed reflected a broad cross section of the world, even though it wasn't.
Confusing things:
* The reply format. If you reply to a tweet, your reply will be below the one you're replying to, which readers have to scroll UP from the beginning to see, even though the browser gives you the impression you're already at the top of the page. And there's a back arrow. But the back arrow takes you home, not to the parent post. And if you quote a tweet in your reply, it ends up below your words, indented out. That's the only indenting ever, and it's the only time your reply is above something, rather than below it.
* There are ads and suggested tweets everywhere, cluttering your feed.
* You don't know who to follow, or why you should follow people. People you follow might change their name every 5 minutes, so you can't remember who anyone is or was. You're told to follow important people, so during a volcanic explosion in Iceland, you follow an Icelandic volconologist, but the only content you see is stuff they quote-tweet or reply-tweet to with no context that's apparently an inside joke in some other community they're in.
* Am I seeing the whole feed? In chronological order, or?
* Why the character limitation? And the awfulness of threads and how where/when to reply in one that came as a result of this.
* Can't follow a hashtag, utterly inexplicably. About the only use case I found for it, wasn't available.
* Limitations on number of characters
* Utter toxicity of most of the userbase.
* Inability to form smaller communities. Everything is public, just people shouting into the void for attention.
And then, of course, the usual cultural things you have to learn from cues over time which I never got comfortable with because I didn't spend enough time there. Where the hashtags go; inline, at the end, at the beginning? The intricacies of when you @ people, when you DM people, etc. The discomfort with finding a voice in a public shouting match.