I regularly make my own dressing as well! I have a few basic recipes—most are pretty much the same as yours. One I like in the summer especially is a really simple one:
+ 2 parts olive oil
+ 1 part honey (try and make it good wildflower or clover honey)
+ 1 part squeezed lemon juice (add some zest as well if you're feeling energetic—I hate cleaning graters)
I do something similar. Mine is olive oil, balsamic vinegar, and a tsp of really strong mustard. I put mine in a small Tupperware in the fridge, that way I can shake it up easily to mix, and I just add to it as I get low.
I actually started with a bit of honey and removed it after some experimentation. Figure any time I can avoid adding sugar and like the taste as much or more, I should take advantage. ;-) I'm with you the cleaning graters-- too lazy for that... Depending on what's in the salad, I'll adjust the proportions, or even throw in some turmeric, paprika, or sautéed garlic.
Having a dishwasher makes using a grater so much less dreadful - perhaps more than any other single kitchen implement. When I had a dishwasher at home we even got a Microplane zester. It's amazing how much flavor and aroma exists in lemon (and other citrus) zest that's not in the juice.
+ 2 parts olive oil
+ 1 part honey (try and make it good wildflower or clover honey)
+ 1 part squeezed lemon juice (add some zest as well if you're feeling energetic—I hate cleaning graters)
+ Salt & pepper to taste