My wife does photography on the side. She does mostly kid's portraits and family portraits - all outdoors, no indoor studio, since kids smile more when they're running around having fun, and also realty photography (inside & outside of houses). She does the portraits during the warm months and the house stuff year-round. Weddings here & there, but she doesn't like the stress that goes with it, since she mostly does it for fun rather than money.
As far as most despised, it just depends on what you like and don't like. Personally I love screwing around in Photoshop, even more than actually taking pictures. My wife loves taking pictures, but not tinkering as much - if an editing job goes on for more than a week, she starts getting sick of it. A typical portrait session is 500-600 photos, of which 200-300 are delivered to the client with basic processing, and a select handful are extensively edited, to be suitable for framing in a living room or wherever. Me, I could spend weeks on a batch of photos, and days on individual images, so as far as what is most despised, it really depends on what you like. I like taking photos too, so I wouldn't say I despise that, I just like certain parts more than others.
I think part of that really depends on the type of photo job you're doing. If you're getting paid minimum wage to sit at an indoor photo booth for kids at K-Mart, try to get them to smile, snap their picture, edit it for 10 minutes and then print it out on the spot, you might get sick of that. If you're just learning, then you'll have a blast until you master it, then get bored of it and want out. What's great about photography is there's always something new to do - a new location or person to shoot, a new plugin to play with, a new contest to enter - so it never really gets boring unless you never go out and shoot.
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