In my experience, you can get a lot done without RDing as long as you don’t get distracted. For my family, dining reservations and park hoppers were the big distractions.
My family consists of all adults: my parents, my partner and myself and my young adult sister. I have been on Disney trips with each one of them individually and we can arrive at park opening. My partner and I RDed 2x at Disneyland Resort. My sister and my mother RDed at MK and were the first guests of the day on Peter Plan. However, with all 5 of us together, we cannot make it to the park at opening time. Ironically, my parents and sister are all morning people. They are all up in the morning before 7 am, but can’t get out the door before 9 am. Additionally, my sister and mother don’t stay up late. My sister in particular is done by 10 pm (unless she is having lots of fun; then she can last until midnight).
For our June 2017 trip, I anticipated that we would not be RDing. I avoided parks with early EMH even though we were staying onsite. I started all Touring Plans at 9:30 am or later. Most of our FPs started at 10 am. We had 7 day base tickets (no hopping ). We did 1 table service meal per day (occasionally 2). I also anticipated that we would tour inefficiently and set our walk time to relaxed even though we have a lot of fast walkers in the group. We only stayed until park close once. We did everything we wanted to do over our 7 days. Everyone had a good time.
For our May 2019 trip, we did have hoppers and we agreed to RD. This was supposed to be a 5 day trip, but ended up being 8 days for some of us due to accommodating different schedules. We also had a lot of dining (2-3 table service meals per day). Well, of course, we didn’t make RD… We were constantly hopping to get to our next dining reservation. In the span of 8 days, we did fewer attractions than in 7 days.