I have 4G on my iPhone and to be honest that is pretty incredible, fast and reliable I stream all the music I play while driving and it rarely struggles. It also works perfectly quick for tethering to the laptop when away from any WiFi.
5G could well be revolutionary, but I wonder how many will really need the power it will provide.
You are right. 4G is fast enough to meet our most of the needs. But 5G will surely blow our mind.