Yeah. Gigabit should be good enough for *most* people's use-case, but if you want to transfer massive amounts of data it can actually become a bottleneck.
For example, if you need to transfer 1TB of data, it would take 2.2 hours at consistent gigabit speeds. Peeps with home servers in the tens of Terabytes may require higher transfer rates than 1 gigabit can provide.