Lol yes this. My family is decent with RSVPing but we are so close most of them assumed they didn't actually have to go on the website and check yes haha. FH's family will probably just not RSVP if they aren't coming so we'll have to check on all of them.
I think my family will do well, but no idea about fiance's family! There's just so many of them lol. I think our friends won't be that great at doing the formal RSVP, but will rather just tell us in person
We are still 6 months out. We've sent Save the Dates but no official invitations yet and surprisingly already have about 20% of our RSVPs officially back. I'd say for us, its easier to get RSVPs back from younger people like our friends and cousins because they are more tech savvy about going to the website. Something else I found that helped was teaching my parents how to do it so they can help our other relatives.