I'm with Rob here. Think about what would generate a picture sale, or make it into an album. Instead of the spray and pray method, create the shot visually, and as is the big thing with wedding photography, position yourself to capture the memorable moments by anticipating what is going to happen next.
I've cut the culling in half by being more selective of what I shoot. When I first started out, it wouldn't be abnormal to come home from an event with ~2600 images between myself and my partner. It was so repeatable, that we were always within 50 images of that 2600 mark.
Take an overall look of what you have a lot of images of. My guess is that you have somewhere around 1/3 of your images of drunken dancing. You still need to be ready for those memorable moments (like when the best man gets into a dance off with the bride), but the couple isn't going to put the drunken dancing pictures into an album. Yes. The friends in the pictures might buy one but you're not going to generate a lot of revenue from those images.
In regards to overall workflow, I watched an educational video from the PPA I believe it was and they recommended using flags in Lightroom instead of the star rating system. I'm not a fan of that, and use the stars.
- Star - Obvious reject
- Stars - Worst case use, heavy PS work
- Stars - Presentable might require work
- Stars - Album Worthy
- Stars - Portfolio Worthy
I then filter on greater than or equal to 3 stars. If there is a key player I missed I can doctor up a 3 star image to make it more presentable, and it might get to a 4 star rating. I will give a quick working on 4 star images, and the 5 star images will get additional time.
On delivery, I create folders getting ready, formals, service, and reception. The four and five stars go into respective folders. The three star images are also delivered into respective folders. I don't believe the photographer should be responsible for determining who gets delivered to the couple. For all we know, a terminally ill person might be in the three star category and you end up capturing the last memories of the person.
Way oversimplified, but that is what has really improved my workflow.