The first time this ever happened to me was from Sega to Nintendo. This was in the Super Nintendo era.
Recently, I jumped from the Wii to the PC. I played the Wii a lot until this year. It's easy to run out of things to play when Nintendo did not support the Wii until the end. Then Guild Wars 2 came up and I bought a PC just for it. Now it's all I play. WvW rocks too much!