Same i too felt. I was using 500 GB HDD in my old PC, after i bought new PC i got 1 TB HDD which i never needed. All i needed was performance, so replaced it with a 500 GB Samsung Pro 850 SSD last year. I am yet to fill half part of the SSD. These days hardly anyone stores movies and large files on PC since many things can be kept in cloud these days.
1 TB is too much for one user who does not use pirated things. (Like me)