Should I buy a car, or keep riding my horse to work?
TIA
Since figuratively you only live a block from work, stick with the horse. The gas is much cheaper, and so is the insurance.
We have currently a 100mbps connection (connection between 85k on the low end, 150+ on the high end). It runs flawlessly. Most people really will not notice the difference between 50 mbps and 1 gbps realistically. As it is I download a 5 mb song faster than I can click on the next song to download, for example. Technically most streaming services run at rates at a max of 10-15 mbps outgoing, meaning if you can match or better that then you will have flawless streaming without buffering. I know netflix runs at 3 mbps for HD content. So if you can average higher than that, then the only thing slowing you down is your own computer, not your internet connection. So anything beyond 50 realistically is overkill. It is a lot like having a $1000 video card to play minesweeper or tetris or something, or paying for a Ferrari when that horse will get you there just fine. For the average user it's overkill and wasted money...for now.
But if you just want the fastest internet you can get, regardless of cost, or if you are getting a great deal on it, then go for it. The biggest plus you will get is fiber does not usually constrain upload speeds, so you can upload those pictures to facebook insanely fast, instead of just regular fast (most ISP packages average about 10-15 mbps upload regardless of download package speeds).
This all changes if you do some hardcore gaming or other bandwidth intensive activities. Some gaming will require higher download and upload speeds to move packets fast enough to avoid the dreaded "lag". But most internet games are built for current standard speeds or actually a little less which are usually around the 25 mbps max range worldwide, but the large majority of the most popular games run very well at speeds in the 5-6 mbps range.