What potential employers look for
Quite different from the client's cursory flick through your work, the employer will want to dig deeper. This is not a one-off job but a longer-term relationship and probably not just between two people. A potential employer will be looking for unique skills that you can add to his or her team and also how you will fit into that team at a personal level.
There's no hard and fast rule, and it depends on the particular situation you are applying for. Someone who produces stunning graphics will have different qualities to one that specialises in coding and that will be taken into account. Even though graphics or coding is not your thing, you should be aware of what is happening around you.
There's nothing wrong with using a WYSIWYG editor provided you can show that you are controlling it and it's not the other way around. Finicky hand-coding might be efficient from a page rendering point of view but few people will be impressed with it if it takes twice as long and they can't see any advantages in the final result.
It's certainly good to know how to hand-code but it's not the only factor in the equation.