It is very fitting that this question came up this week, considering that past 24 hours we have had: (three with fevers, a 6 hour ER trip, and then a visit to the doctor for all of them).
There were so many key moments in the twins' lives that helped lessen the stress and work involved with tending to not only the twins, but their older sister who is 17 months older. It took a long time for me to feel like it was easier and so much more enjoyable than the stress of trying to be an octopus tending to three very small children that needed my attention 24/7. I would say that it officially got easier when the twins were 15 months old. Both of them were much more independent when it came to feeding, drinking, napping, sleeping (without night terrors), walking, and talking. I no longer feared leaving the house with all three children, and knew that I could manage it if I must take them all with me. So for me, easier involved independence.
I believe that it gets easier for everyone at different stages and know that even though it got easier, it doesn't mean it will stay that way. Like right now we are attempting potty training with Kinsley and I know that I will have to go down that road with Eligh soon, and it is a battle. I have to be on constant watch following her wherever she goes to help prevent her from having an accident and asking her over and over again, "You want to go potty?" I think about juggling sports, after school activities, driving, college, and all those things I know will not be easy and I'll miss the days of changing diapers and holding little ones snuggled up on me sleeping.
Raising children is never easy, and that is why it is not for everyone. I definitely think that having three children close together with a set of twins changes things.