I know it's safe, but I'm not going to lie, it's still disconcerting feeling the concrete roll beneath you while it's going on. Cool, but disconcerting.
In a previous life, husband covered Nebraska football, & went to A&M one year (when they were both still in the B12) At his seat in the press box, there was a note saying "Welcome to Kyle Field! *blah blah blah* Please do not be concerned if the press box begins to sway during the 'Aggie War Hymn'..." Sure enough, the press box swayed because nearly the entire crowd was swaying.
I remember how Jack Trice shook during "Sandstorm" on 11/18/2011. Holy shmokes.