Definitely on the high end, but having centralised most of my storage (backups, media etc.) to a NAS, 10Gbps would definitely be welcome. Pushing large backups to my NAS is time-consuming, and e.g. video editing basically requires pulling it down to a local drive first (not to say it'd be ideal to use a network store for that at all, but it'd be more viable).
My home network still runs on 100MBit, because of a stubborn old switch that refuses to die. By now, my curiosity to see how long this thing will last (it is about 13.5 years old) outweighs my impatience when pushing large files around. ;-)