I was lucky enough to attend a UMCP game in Cole Fieldhouse before they moved out of it and it was a raucous environment. Granted they were also playing a ranked opponent and they were good at the time. So, I would have ranked the old Maryland gym up there and maybe even cracking the top ten, but it looks like the new facility isn't as intimidating. Just my two cents.
Back to the OP, I would agree with the list drafted by NetflixClone with the exception of definitely not UCLA and maybe even removing UNC. That is if we're talking about the CROWD creating a home court advantage, and neither of those places seem to do it much. When UCLA isn't good, they literally struggle attendance-wise and the crowds rarely appear intimidating on TV. UNC is always packed, but the crowd seems complacent, a little spoiled with winning and likely to sit on their hands for long stretches. Perhaps replace those two with San Diego State's arena (which has been raucous and intimidating over the past ten years or so), and maybe Wichita State or VCU's arena. They appear pretty intimidating when I see them on TV, but maybe that's only for big games?
Honestly though, from an objective perspective, I don't think Hilton has the magic or hunger in the fans it used to have in the 90s when I was growing up. It is probably still top ten. Maybe my perspective is skewed, but it seemed like more people were participants in the action and literally willing the team to make runs whereas now more people in the lower section of Hilton and the upper corners where I've been stuffed recently seem to be spectators rather than consider themselves participants in the action. I really think we've been spoiled lately and I wonder if the pricey donation rates has priced out some of the younger - and perhaps louder / more intimidating?? - fans from the lower section. I don't have any statistics, but wonder if there's more older people in the audience today than 20 to 25 years ago. Hah! I know that may be blasphemy to some of you, but I'm trying to look at it objectively and not through cardinal colored glasses.