I found going from 2 to 3 FAR easier then going from 1 to 2. There is 18 months between 1 and 2 and 18 months between 2 and 3, so I had all 3 in 3 years.
I enjoyed baby number 3 the most, and now they are older, they are ALL older, I'm not dealing with newborns and school kids. It is quite frankly bliss, and I don't regret having them so close together for a minute.
So I'm not sure if I found it easier going to 3 because of the close age gap, and the fact that I never had to go BACK to nappies and sleepless nights etc. because I hadn't actually left those stages yet IYKWIM.
Good luck with your decision and TTC