I have 5Gbps symmetrical. I love having it, but the biggest use-case has been bragging about it to my colleagues. I haven't even had the full bandwidth available at my desk for a while now (I've had a terrible time terminating cat6a for reliable 10Gbe, so I'm usually on wifi), and it hasn't really bothered me much.
Even 1Gbps has been hard to justify for me TBH, most things over the internet aren't fast enough.
The nice thing though, is that latency is great independent of other traffic as bandwidth is pretty much never saturated
Yes, latency is excellent. My ping time to 1.1.1.1 is 6ms on wifi.
For me, with upgraded networking it's been huge. Much faster downloads and uploads, I can share more with family members, and when multiple people are using my bandwidth, no slowdowns. Most of my equipment is 2.5g, but still is a fairly significant upgrade, and the per month additional cost is $30/month so makes it worth it to me.