I have noticed a huge difference since we got LTE, but I am comparing CDMA 3g to it, so the difference is more pronounced. I have used my phone to tether to the roku for Netflix when cable went out, and to the xbox for online "black ops 2" during the same time. 3G would not have been sufficient for my uses there. WIth LTE it worked without a hiccup . For everyone it may not be as big of a deal. For my uses, not that I have it, I wouldn't want a device that didn't offer it. Just my take.
That's probably it. You're comparing CDMA to LTE. That's a massive difference. I was going from HSPA+ (3.5g) to true 4G LTE. I was already getting between 5 and 10 mbps on HSPA+ Maybe that's what it doesn't seem like a big deal to me.