Actually, Japanese congregations meticulously send and receive love and greetings every single time someone from a neighboring congregation is attending. If you visit a congregation, you will be spotted within seconds and asked if you brought the love and greetings from your congregation. You can't just arbitrarily bring it, which means that in preparation for your planned absence from your own congregation, you asked your congregation for the love and greetings to take with you.
The long and short of it is that at about 75% of meetings, there are announcements like this:
"Sister Takashima will be attending the Neighboring City congregation on Thursday. Would we like to send our love and greetings with her?" (Allow for applause) "Also, Brother and Sister Nomura from the Other Neighbor congregation have brought their love and greetings." (Allow for applause) "Would we like to send our love and greetings back with the Nomuras?" (Allow for applause)
Honestly, it felt kind of nice at first to have all this love and greeting going around, but after about the third meeting, it started getting long and unwieldy. After about the tenth time in a month, it just seemed absurd. No one is encouraged, since it's such a mechanical thing. I think the only real effect is that since, in effect, you have to report when you will be missing your meeting (by asking for love and greetings to take with you), everyone knows who is missing for "legitimate" reasons and who is just skipping. Asking for love and greetings becomes this song and dance where you say, "Hey, I'm not going to be here on Thursday, but it doesn't mean I'm missing meeting! I'm still cool!"
I came to detest the love and greetings for this reason. They seemed much more real in America, where the Witnesses reserved them for people from faraway places. It seemed a little more special.
SNG