Talk to your caterer about serving a medley of desserts, offering a different dessert to every other person at the table so couples can share. If you want to offer more than two options (plus wedding cake) you can server buffets in a variety of ways.
Does the space allow you to move back to the cocktail hour room where you can set up a dessert hour? Offer several sweet stations, passed mini-desserts and a selection of dessert wines, cocktails, coffees and teas -- you could even throw in a shake or malted station too!
Or create one dessert buffet with a variety of desserts and invite guests to help themselves. Are you pie-lovers or cookie-fanatics? Make the buffet all about your favorite treats -- a cookie bar, brownie bar, pie buffet, etc.
Some guests may want to take dessert home with them so set up bakery boxes and/or bags on the side so they can make their own goody bags or have a waiter nearby to help them.