There are so many items marketed to soon to be parents these days. If you bought them all, then good for you, I hope you find them useful. Unfortunately, I never really used most items with my kids.
I change diapers on the bed, couch, floor, or while my kid is standing up so I never used a changing table. I don't use diaper cream because my kids are allergic to everything and breastmilk cures most things. We limit our use of baby wipes because of allergies as well. Warm water and a paper towel or regular towel work just fine.
With my first child I never bought a nursing pillow. With my second one was given as a gift. I realized quickly that I preferred the side-lying position or a pillow under baby more than the nursing. To be honest, I think the crib was a waste of money because bedsharing is so ingrained in a baby and toddler's brain. They need to be close to mom and dad so they instinctively prefer to co-sleep or bedshare in most situations.
With my first child I purchased too many clothing items and she grew out of them so very quick! Now I know that five to ten outfits is plenty for any of my kids and anything else is a bonus. Also, we have found that using less detergent plus HOT water takes care of funky smells and allergens better than more detergent and cold water.
I have learned that buying a noise machine is a great idea. However, purchasing multiple twenty dollar learning toys is a waste because my kids prefer daddy's soda box plus some paint or crayons. To this day all three of my kids prefer dollar section toys to toy section toys anyway. However, concern is the potential for poor quality or carcinogens in these toys.
In short, I don't blame parents for buying all the new cool stuff. I do realize now that my family wasted money on many things we did not need. Now that we have three beautiful children, I am very glad to say that we have learned to purchase what our children need and a few extras for fun, not necessarily all the stuff we supposedly need according to society or baby magazines.