My gallbladder tried to murder me back in August. The surgeon told my wife I had a "verrry angry gallbladder." They described it as basically a spiky ball of hardened death. I'd been having abdominal issues for years. Couldn't stand a friendly poke in the belly. Had been diagnosed with everything except gallbladder issues. One weekend, I felt some abdominal pain after eating, as I often did, and wrote it off as gas as I usually did. By day four, I said "Time for an ER visit!" (I have a fairly high pain tolerance, and tend to put things off until they're reaching fatal proportions.) So, they went in and yanked it out. I got not three, but . . . count 'em . . . five laparoscopy holes.
And I felt GREAT afterward. I didn't even take the prescribed painkillers when I was recovering, just some Ibuprofen to help with the swelling once a day. I did have some post-surgical pain and swelling, but barely noticeable after four days of Murder Ball rocking out on my liver.
The surgery is one of the most common, if not the most common, performed in the US. My doctor had done so many, that he even removed his own gallbladder! (OK, that last part isn't true.) So, surgery-wise, not too bad, really. Very routine, relatively un-scary.
As for the after effects: The doctor said that you can avoid fatty foods afterward if they bother you, but that in the long run, dietary restrictions really didn't matter. Your bile ducts will kind of stretch to expand their capacity and compensate. I haven't had any trouble unless I eat way too much dairy, but other fatty foods don't send me rushing to the bathroom. In fact, I have less issues now than I did before, with the malfunctioning gallbladder intact. I'm not saying that there isn't a possibility of side effects, just that I was told that they were low and that it proved to be the case for me.
I can't speak to the other issues, but if the gallbladder has to go, chances are you'll barely miss it.