Has anyone tried Loving Kindness meditation? "Empty your mind" type of thing never did much for me but Loving Kindness meditation featured in New Scientist so I

Has anyone tried Loving Kindness meditation? "Empty your mind" type of thing never did much for me but Loving Kindness meditation featured in New Scientist so I gave it a go out of curiosity. I found it remarkable. If you spend deliberate concentrated time imagining someone you know or might meet and them becoming happy, you later get a weird sense of joy when you do meet them. You anticipate and look forward to nice things happening to them and unconsciously strive to make that happen. What's fascinating is that it works with people you dislike/have trouble with. It really does foster empathy. Kindness when treated as just a behaviour will be an uphill struggle, there will be conflict between what you want to do versus a correction. However when your first instinct, your desire without thinking about it, is to be kind - its no bother.