Single:
come and go as you please - don't have to consider anyone else's plans if you decide to go to a movie or a lecture
control the TV remote
eat what you please, when you please - simpler meal planning - sticking to a diet (not having to take his meals into consideration when you are making an omlet for lunch)
less laundry / less housework (read the newspaper and put it in the recycling rather than have it lie around until he is through with it)
reading in bed (or watching TV)
having the whole bed to yourself
control the thermostat
usually less income but more control over how it is spent
more often invited out by singles - don't have to wonder if this invitation includes my spouse
Married:
having somebody around who cares for you
someone to talk things over with / and perhaps to blame when things go wrong
someone to take care of you when your sick
someone more knowledgeable about cars and plumbing and who appreciates your skill in reading, writing and balancing household accounts
more income but less control of how it is used
cheaper travel when a couple shares a hotel room or B&B rather than two singles paying for separate accommodation
more often invited out by couples - most card games are for partners
Many people expect their spouse to go to bed with lights out when they do. This, along with reading (or TV) in bed can be solved as you get older and discover that you both get more rest when one of you sleeps in the spare room. (This doesn't mean that you don't visit for a cuddle or an occasional night together.)