I did 3 weeks of “double days” in December – AM easy ‘double’, Taku -1 or Dans; PM hard workout.
I can’t say with certainty if they were helpful or not, but they did wake up the legs and systems for the day and in a gentle manner.
As Coach Chad mentions in several inride texts, those easy recovery rides have to be very easy, 50% or less, no sweat, no increase in breathing, etc. About the only other thing is pay close attention to how your body feels. Don’t just do 30min just because that’s what’s on the clock. If it’s not easy after 10min, then stop at 10min. If you have to dial it down to 40%, then that’s what you do. Recovery rides are dictated by what your body tells you to do.
But, as with @craigmanning, having one day completely bike free can also be very valuable.