I'm in the 'industry' and go to about 80 weddings a year.
Choose a venue that is easy to get to - not somewhere that's a £40 taxi journey from the nearest station. Unless you (and your friends and family) are get away from in in a field types. Choose somewhere close to cheap accommodation if guests want to stay over.
A late afternoon / early evening wedding followed by a fabulous, high quality buffet is great. It avoids all the hanging around for guests (which they seem to hate) and it avoids you paying massively over the odds for a poor quality cooked, sit-down dinner. It avoids the decision about day and evening guests and it minimises difficult issues about children at weddings (people seem to find it easier to get babysitters for evening weddings, and in general only tiny babies are there).
Canapes are a massive waste of money. It costs a fortune to budget for 3 little bites per head, and it's actually quite random whether everyone gets 3 - the wedding where the groom's big hungry rugby-playing mates ate about 8 each didn't leave many to go around the rest of the guests. Ditto the cheap glass of fizz to go with the canapes. If there is so much 'hanging around' time required for photos between the service and the meal then you're planning your day wrong. Better to have a pay bar and an ice-cream cart, or a popcorn cart.
Don't let your venue or your photographer dictate the timings of the day. Photographers sometimes want hours for the photos (hence the need to feed, water and entertain your bored guests) - find someone who is a great photographer and can work quickly.
Don't stress about chair covers, matching tie backs, favours etc - no-one will particularly notice, and often favours get left behind.
Be on time! Hair and make up people often underestimate how long it will take to get everyone ready, so try to minimise how many people they are 'doing' and however late you are the photographer will still want photos of the bride emerging from the car etc. Leave loads of time for the pre-wedding photos (if you want them)
If the ceremony is important to you spend time - with your partner - thinking about what you want and how to make it personal.
Be in charge. Don't let anyone persuade you to have another layer on your cake, an expensive pre-wedding engagement photo shoot, a balloon arch, a photo-booth, beads and glass and sparkly things on the table, a sparkly dance floor, light up signs with your names. etc, etc, etc. UNLESS you really want them.
A personal ceremony, some great food, and a brilliant dance are the key elements.