as I am hearing that I'll never get gigabit speeds over WiFi
Gigabit is not a speed. Gigabit is a size. Compared to a lesser data plan, Gigabit would be a bigger "pipe."
For example, if I have 10 Mbps plan and you have a 1 Gbps plan, both our data are traveling at the speed-of-light. However, since you'd have a bigger pipe, you'd get more data traveling at the speed-of-light. If widermouthopen sent us both a 125 MB email, you'd receive it in 1 second and I'd receive it in 10 seconds. If Wider sent a 1.25 MB email, we'd receive it at the same time. A bigger plan is just a bigger pipe.