I've designed a few scarves and shawls that fall into this category of deceptively-simple lace, most recently my Hextile Wrap:
Its basic elements are garter stitch with some areas of yarn-overs and k2togs, and once you get the gist of the pattern you really don't need to check the chart/instructions very often. The speediness of simple lace means you can see the shapes emerging quickly, which is really satisfying. I find it keeps me wanting to knit "just one more repeat"...
Two of my lace shawls which I think also hit this sweet spot of simple-but-satisfying are Folia Crescent, which has a nice small easily-memorised lace repeat, and Silverwing, which has a closely-related lace pattern elongated into feathers.
These two designs aren't quite as straightforward, since their vertical ribs mean no 'rest' rows on the wrong side, and they also require the occasional double decrease stitch in addition to knit/purl/yo/k2tog/ssk. But they do share my favourite characteristic of simple geometric lace in that you can always tell what comes next, just by looking at your knitting.
I'll be casting on a new simple lace shawl tomorrow. :)