Compared to AC, SQ, and NH (the other airlines I've flown recently), UA does indeed seem to be excessive with their announcements. (AC domestic—so En & Fr—seems to have fewer/shorter announcements than UA domestic—so En only.) It's not just the repeated smaller-item-under-the-seat announcements as people are boarding, but that's excessive too. It's so much more pleasant to board a flight or to actually sit back and relax if the announcement are kept to a minimum.