As someone from one of these top proficiency countries, Sweden, it's not just the educational system. Learning english in school will only get you so far. You need to be exposed to english much more than that to become proficient. I was lucky enough to be incredibly exposed to english due to having an aunt that lived there, however.
I remember being on vacation in Germany as a kid. On the boat to Germany, there was a TV and no one around, I was bored, Terminator was on, cool. Except... They spoke german. I flip the channels, find the Simpsons, and they speak, german. After we had gotten through Germany and made it to France, I once again saw something on a TV somewhere, and they spoke French, though I could see the lips didn't quite match what was said. I realised it was dubbed to French.
And that's when I understood how I, as a 12 year old kid, could speak english better than most german and french adults.
These days are different I'm sure, but it wouldn't surprise me if there are some traces remaining.
Yes and No. There are certainly people in the common pleb that love Eurovision, I'm personally not that into it. It's every single year. It gets old quick. IMO, if they made it a bi-yearly thing, people might be a bit more excited about it. But that's another discussion.
Either you seem to be really loving eurovision, or you seem to have had enough of it for a lifetime. So I think it's a very divided 50/50 split, probably varies from year to year depending on whatever song your country picked. I haven't really watched it in 15 years or so, these days the songs are out on Youtube pretty quickly, so even if there's an artist I like, I'd just listen to their song individually rather than sitting through an hour long broadcast.
Sometimes there are some solid songs I enjoy, Maybe wouldn't put it on deliberately but if it came on the radio i might bob my head to it.
Personally, I think the greatest song ever produced for Eurovision was made as a half-time joke by a bunch of comedians, and thus, wasn't an actual entry into the competition. https://www.youtube.com/watch?v=e1ozCWyUlCg