The thing that we absolutely used the most and had to buy many more of were swaddle blankets. There are different opinions on swaddling your baby and I know some babies don't take to it, but ours did and the swaddle blankets made it SO easy. We would gladly buy stock in the company that makes them!
As far as 'toys' go, we had the activity mat, activity gym, exersaucer and jumperoo. There were times in Aaron's life that he loved each one of those things, but the phases never seemed to last very long. Honestly, I was glad that we had received those things as gifts and I'll definitely pull them out for the next child, but Aaron always did really well on the floor with a blanket, so...
Oh, the swing. This wonderful, wonderful swing. There was a period when Aaron LOVED the swing. It was also (relatively) short-lived, but so worth having it for the time when it was his favorite thing. That was a fussy age and the swing was wonderful.
The Bumbo is another such item. I was told the Bumbo was the greatest thing ever. And it was. For about four weeks. Up until he was certain age, he wouldn't get in the thing. Once we decided he liked it, it was wonderful. But then he learned to sit on his own and wouldn't have anything to do with it again. Maybe if he had taken longer to learn to sit or he had taken to the Bumbo earlier, I could have gotten more use out of it.
Here's something that I didn't use. I don't even have a picture of it. I am sooo glad that this was a hand-me-down. Our travel system stroller with the infant carseat. Aaron hated the infant seat. He hated it pretty much from the beginning. We went to a convertible carseat very early and it made a huge difference in road trips for us. As far as the stroller, I used it one time. Once. It was traumatic and I never used it again. Then he got big enough to go jogging with Daddy, so the jogging stroller that Grandad and Mimi gave us went into use big time. That's what we use for walking now. And when I go anywhere (like the zoo), I just throw the umbrella stroller in the trunk. It is so easy and it works well for little outings. We bought the A&M umbrella stroller when we were pregnant. It's one of the few things we bought and it was well worth the investment.
Other things that we didn't use: we did not go with a diaper genie or diaper pail of any kind. My friend told me about Sassy Sacks and that's what we use. They are easy and smell good and take up no space. It was the way to go for us. The same friend told me not to get a wipe warmer because it dries out the wipes. So we didn't and we haven't had any problems. I think those may be the only two baby items we did not get, though. We were SO blessed by our friends and relatives and Mr. Aaron has absolutely reaped the rewards. And, as a parting gift, here's a picture from today. Aaron and I had lunch with my friend Allison and her beautiful daughter Kate. Kate is just precious. Aaron thinks so, too.