There was a good 3ish period where almost ALL I listened to was 'loid music. I think it's a big old mix of genres and styles which have one thing in common; synthesizers!
Technology is awesome, and vocautau combines that with art! Especially in utau's case, it's even cooler when you can participate in the making of music yourself, and hear your own voice do incredible things!
You are not alone, I honestly listen to UTAU/VOCALOID/CeVIO music every day I hardly know any human songs (unless if a vocaloid covers the song lol then that's the time i'll listen to the song XD)