How are you greeting your guests? I was sure we wanted to go table to table during the reception but I know the past two weddings I went to 1) I had to leave early so didn't get a chance for the bride and groom to get to our table. We just grabbed them for a second before we left. 2) The bride and groom never got to our table between them trying to enjoy themselves on the dancefloor and some tables taking tooo much of their time. Again, had to go grab them for a second because they never came to our table. I would feel bad if someone had to leave and I didn't get a chance to speak to them.
I thought dismissing rows would take to long but I've heard feedback that it goes quick. We're having 125 guests and even just giving them a quick hug and saying hi I would feel so much better.