With DD1, I couldn't see the point of the stroller. She hated it from day 1 onward, and wouldn't ride for more than a few minutes without screaming her head off. So it sat in the garage and gathered dust. Honestly as she grew, I would spend 6 or more hours with her on my back and stare with envy at the moms whose kids were napping in a stroller. Carrying 20 pounds around for hours is hard, no matter what you use to strap it on.
Then I slipped a disk in my back. Luckily DD1 was old enough to walk, and if her legs got tired, we went home. But carrying 20 pounds of toddler was not an option.
Enter DD2 stage left. Now i have a bad back and two kids, weighing in at over 50 pounds for the both of them. If we are going to walk anywhere for any length of time, the stroller is a must have item. Now that DD1 sees DD2 riding along, SHE wants to ride too. So we kept ending up with DD1 in the stroller, DD2 in a carrier, and poor mama drugged up and immobile by the end of the day. Even DH gets tired of lugging around 50 pounds, and wants the stroller that he used to hate if we go out as a family. Carrying 1/3 or 1/4 of your body weight is hard, even if you are fit and healthy!
I just got a Phil and Teds double for the holiday, and I'm in heaven. Finally we can go to the zoo, the airport, the mall or even for a walk in the neighborhood without me ending up with pain, drugs, and emergency chiropractic visits. Hooray! I am a true stroller convert.