since taking up road cycling earlier this year, I lightened myself by 15 lbs, i lightened my bike by 4 lbs, and my gear (helmet shoes clothes etc) by maybe 4 lbs. 23 lbs represents around 10% of the total load, but combined with getting a bit stronger and better gearing it feels more like 33% easier to ride up a hill. and 50% more fun.
so while I agree that only a pro could “feel” a pound or two here or there, it all adds up and compounds with other factors.