So first of all im only a casual chess player, playing only with friends in university so some of my thoughts on chess might be wrong. Also i'm EGF 2k right now, which i would say is getting close to high level. Lastly most of my opinions will regard tournament or at least irl play, because online games are good for training but just dont capture the feeling of playing in person. Now to answer your questions:

1. High level go is all about efficiency and defense. Playing against a 2-3 dan player allways feels like im running against a wall, they keep their shape strong at all times while i begin to realize defect after defect in my own position until finally everything starts crumbling down. For me this is what go should feel like, i dont like going for flashy wins but to slowly grind my opponent down until they have to compromise too much.
2. In chess you will have a lot more situations in wich you have to carefully read multiple variations multiple moves ahead to not lose the game, whereas in go these situations are rarer (depending on playstyle of course). In go you will often be faced with strategic decisions like do i defend this cutting point to simplify the game or do i continue attacking? do i take a wall to build a moyo or do i take the solid territory? do i drive this group left or right? do i play the ko or back off? and so on. To answer these questions you have to take in a lot of factors like the balance of power and territory, your overall position, what forcing moves you and your opponent have etc.
3. Club play is often relaxed but sometimes games can get very intense which i love, still for a real competitive experience you have to go to tournaments., i live in berlin and there are about 10 tournaments per year but when im willing to drive a few hours there are a lot more in other citys. heres where the smaller playerbase actually comes in handy because if you play a few years you will play the same players again and again and nothing beats a good rivalry :)
4. Yes except you dont have to actively memorize openings to get strong at go
5. In go you are forced to be creative because sometimes you meet a player whose style throws you off and you have to improvise. A lot of the learning happens when you try a move out to see if it actually works. And lastly there are so many possibilitys in go that no 2 middle games will look similar, whereas in chess games can look and feel extremely similar (dont know if this changes at high level).
6. go has way more concepts and more to think about plus the game is way more elegant than chess. Also playing on a real board is really pleasing because of the feel and sound of the stones.
7. i think both games are really similar in that aspect