currently in grad school and it feels sorta the same as undergrad like, structure wise? classes feel the same, assignments feel very similar. but way more focused on the subjects YOU have chosen to learn about. i think it is a little heavier in terms of workload and general availability of free time but it's a quick adjustment. i also think the bonds you form w your classmates are way stronger (although i'm in a cohort model so that may just be me!)
overall i'm very glad i committed to grad school as someone who once said they would never go :)