If you don't use something like TextMate snippets (or some other auto-completion), then it's definitely overly-time-consuming IMHO.
The movitation behind SHPAML isn't necessarily just to make the markup easier to write; it also tries to make it easier to read.
Good HTML is hard to write. Look up HTML source of several major websites, and you will see how badly indented it is. 95% of them won't validate. Look at this page. It doesn't even have a doctype.
That's largely because it's hard to care.
Browsers don't halt when fed less-than-good HTML the same way an interpreter/compiler dies when fed bad syntax.