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More or less. "Floats your boat" is a bit lighter, more like a joke. But yeah, they are the same kind of thing.

Not quite.

This expression is often an insult. It can mean that you don't agree with what the other person is doing or saying, and that you think that they are doing that or thinking that thing...

I'll try to bear that in mind, thanks for the comment :D

ok, I think these are going to be the last ones (hopefully):
Can you give out an exclamation, or you let it out?
And is it correct to...

That's fine. I normally hear "Try as I might . . ." You might want to check a grammar resource on may vs might if you want to be very formal about it.

You just need a period at the end :) That's...

They both refer to listening. Make out is almost always used with a negative to mean you didn't hear something well, as in your example, or "I couldn't quite make out what you said/were saying." That...

That's exactly right.

Usually "say", at least in American English. I've heard "read", but very rarely.

"Point of" and "point in" are the same, but they are sometimes used in different contexts. Here's a few I can think of right now:

There's no point in crying about it.
What's the point in trying?...