Rollercoasters! Hobby of mine since grade five. Show me a picture and I can probably tell you what manufacturer it is, what model and where it is. At one point I memorized every rollercoaster in Europe with this.
I've never been on a rollercoaster in my life. Still I'm having this incessant willingness to ride one for at least few years. What do you think are the best amusement parks in Europe? I currently live in Poland, but will move out soon, maybe to Netherlands.
My personal favourites are Europa Park and Phantasialand in Germany, Efteling in the Netherlands and Liseberg in Stockholm, Sweden. Haven't been to most of those but not because of a lack of will. I've heard Energylandia will open this year in Poland, I'd suggest checking that out!
This Energylandia (what a name!) seems more aimed at children, but I may check it out nonetheless. I remember reading about Europe Park and as I still remember it (my memory totally sucks) it must have seemed interesting. I may go to Germany on summer holidays and visit it.
Every coaster in Europe? What do you think of those in Gröna Lund, Stockholm, Sweden?
Ah Gröna Lund. On my bucket list. It's definitely one of the better city parks. I just love how every ride is woven together: Jetline is one of the few remaining coasters designed by the legend Schwartzkopf and as someone who just came back from riding one of his masterpieces I'd love to ride it. Did you know that Anton always was the first to ride his own ride designs? Look at the guy, being happy as fuck: http://schwarzkopf-coaster.net/pictures/ES/anton-himalayabahn1.JPG I haven't ridden any Zac Spins like Insane, but what I've heard about it is that 50% loves it and 50% hates it. Kvasten is one of the better family rides. And with Vekoma's new train designs, even small children can enjoy the thrill. Twister is a brilliantly made puzzle, that thing goes all over the place and somehow doesn't crash into itself. Kudos to the Gravity Group for that: Did you know that there were plans to extend the park and build an awesome big inverted rollercoaster and a Star Flyer? Too bad they haven't received permission to do so. 
I love Gröna lund. Stockholm is quite close if you go by train for me so I've been there a few times. I am in the love group for insane. It is amazing. And I'm very impressed by your wonderful and complete knowledge.
Less time than you'd think! There have been 1576 coasters in history, but if you narrow it down by coasters that are operating now and aren't kid rides you're left with 476. Still, let's just say that I had a bit too much time as a kid.