Temperature affects the taste of many foods. Temperature change doesn't affect the specific basic flavours (e.g. salty, bitter, umami, sweet) in the same way. So increasing or decreasing the temperature of a food item will change its taste profile.
The source I found says that it is difficult to tell if temperature change will make a food taste "better" or "worse". It depends on too many factors.
In your case it seems that increasing the temperature of cheese makes it taste better for you. It'll probably be because you like the taste profile of melted cheese over solid cheese. Maybe try and perceive what specifically it is about the taste profile that changes for you. Maybe you perceive it as more or less salty, more or less umami.
Bro, you got reverse psychology-ed. She knew you were fully capable but wouldn't put it at the top of your to do list if she just asked.
Now you built something cool for the local birds and your wholesome wife.
What a sucker.
/s