There are at least twenty software packages available. The actual coding is taken care of for you by the editor. You don't have to worry about trying to explain to a designer what you want, and you won't have to make sure everything is done right. The sites are usually not as technically sound as those created by designers. Out of that same group of people, most of them take over a year to get their site anywhere near presentable.
First attempts tend to look like first attempts.
As the months go by, the site slowly starts to show improvement. Usually after a year, the site still looks like a home site, but at least it's presentable. Because of this, it's usually very hard to go in and tweak the code. Also, because the editor has to interpret what you want it to do, you'll often find empty, meaningless code. The most immediate and observable result of this is slowed load times.