We do this too. I have a very bad memory overall, mostly due to my willful desire to forget the past. As a result I reflect very seldom, and never really take time to smell the roses. I also just dump my photos into backups without thinking.

Since my gf and I have been doing our yearly photo albums, my outlook has greatly improved, and you get to summarise your entire year (albeit with some cherrypicking) - which in itself is a fantastic bonding exercise - as well as present it to visitors.

It's a testament to our love, to our shared past, and to our continuing future.