The only issue I ran into with Lyft/Uber in March was that they aren’t always able to get there fast if it is a prime time. It was week before Easter and the pricing and times were definitely inflated.
We were in line for DME and figured we’d check. It made no sense when they said how long It would take and price it would be.
But, for a family, there may be other options that will work out better and faster than Mears will. It will be interesting to see how the waits are once it officially starts.
Their surge pricing will definitely be an X factor. The availability of cars with carseats for families may be an issue too.
Did you try using the scheduling feature? Or did you just do it on demand? Most of the time I use do airport rides I do a scheduled rides which eliminates the waiting, but I haven't done that at Disney before.