For me, it didn't take long. I was initially confused by some "repurposed" syntax in svelte, and kinda felt negatively about it, but I grew to accept it, and even appreciate it (it's a hack, but on the elegant side). There's quite a bit of "repurposing" going on (probably so svelte can work with existing linters and other tooling), but you get used to it.
Svelte has more often "magic" stuff, but the good thing is the magic is simple, and it easy to understand (especially since you can easily look at the compiled output, if you want to double check)
I _left_ Svelte because it was headed in a direction I didn't believe in (all the repurposed syntax). But I gave it a try and had to apologize for disappearing. It is extremely well executed.
One of the primary directives in Svelte is that it all has to be valid HTML so that the tooling can simply treat Svelte like HTML for syntax highlighting. Some of the repurposing is explicitly because of that directive.
Svelte has more often "magic" stuff, but the good thing is the magic is simple, and it easy to understand (especially since you can easily look at the compiled output, if you want to double check)