I'll chime in that I consider myself a well seasoned, and early adopter, of the refresh strategy. Been using it for 2 or 3 years now. I do exactly as AngiTN described when booking my first 3. When I book #2 at the 30 or 60 day mark, it may show up 10 or 15 minutes after #1. So if #1 is 10-11am, it'll give me 11:15am to 12:15pm for #2. I take that one, and then do the same for #3, then will modify #2 and #3 to move them back to where they're back to back to back. Sometimes I can do it right away (at 30 or 60 days), sometimes I have to wait until day of.
Our strategy for using the first 3 is a little different though. We're not rope drop people, we very much prefer to sleep in and take our time. We aim to arrive at the parks right at the end of FP+ #1 window. So if FP+ #1 is 10-11am, we show up at 10:55am. By time we finish that ride, it's already time for FP+ #2. That's just one less thing we have to modify. We've developed quite a talent for making it to FP+ #1 right at the very end, even dipping into the grace period....haven't missed one yet. Then after tapping into #2, we'll immediately modify #3 so that it's as soon as we are done with #2. Then we're off to the races to get more.
Having said all that, we were just there, in the parks from June 14th through June 30th. This year was unquestionably the hardest trip we've had to use refresh and get more. I'd bet I've used refresh strategy for 75-100 park days total, and this year was much harder. It was about as hard as it was during the Christmas to New Years week we did just 7 months ago. I still got things, but not even close to as easily as we did in summer 2016 and 2017. Don't know if it's because more people are catching on or what, but it was tough sledding.