One supplemental note. I've known a number of people who have flourished in impersonal megaversities. They mostly had a common approach: get "adopted" by some academic department ASAP, and try to act like a baby grad student. Even research-first universities are quite receptive to those kinds of undergrads. (I am sure that this approach works with the natural sciences; I am less certain about the humanities.)
One supplemental note. I've known a number of people who have flourished in impersonal megaversities. They mostly had a common approach: get "adopted" by some academic department ASAP, and try to act like a baby grad student. Even research-first universities are quite receptive to those kinds of undergrads. (I am sure that this approach works with the natural sciences; I am less certain about the humanities.)