I have been to a good number of parks, but not a lot of the big ones so here is my current Top 5 coasters. I'll be brief with the ones most people here have ridden, but go into a bit more detail with the ones that a good number of people here probably haven't ridden.
#5: Millenium Force (Cedar Point)
The first and currently only giga coaster I have ridden and what a fantastic ride. I know it doesn't have crazy airtime or a ton of really forceful moments, but it is just so rerideable and that is one of my favorite things in a coaster.
#4: Mystic Timbers (Kings Island)
This is my favorite ride at Kings Island currently. The Beast at night sure comes close and Diamondback is also great, but they just aren't as good IMO. It feels so much faster than it actually is going and it takes it's elements at such a fast pace.
#3: Steel Vengeance (Cedar Point)
I've only gotten to ride SteVe a couple of times back in 2018, but those rides were amazing and I can't wait to get back to CP to ride it again in the future! Also, that outward bank turn is legendary.
#2: Iron Rattler (Six Flags Fiesta Texas)
This ride is definitely short, but it has two of the best moments on a roller coaster that I have experienced so far. The first drop from the lift hill that curves will you fall is by far the best drop on a roller coaster I have experienced so far especially when you get flung out of your seat. Also, the final drop off the quarry wall in the back row is probably my favorite moment of airtime I have ever experienced. The interaction with the quarry wall really adds to the ride as well and POVs definitely don't do it justice.
#1: Eejanaika (Fuji Q Highland)
I, like @Captain Nemo, have been lucky enough to ride this roller coaster and It is by far my favorite roller coaster. It was the first ride I got off of and thought "What in the world". It is so massive and fast and I felt forces on that ride that I didn't even know were possible. The zero-g-roll is by far the best moment since your seats rotate in a different direction than the train does and it creates an insane feeling. Hopefully I will get over to SFMM to ride X2 and get a taste of a 4D coaster again someday. I really wish there was a ride like this on the East Coast of the US because not everyone can go to Japan and more people deserve to experience this ride.