I am not saying I would go out a buy a torque wrench JUST for this one fix. But I am saying that if you have a torque wrench and sockets that fit, use them. JHull, in your post above you state, "you want to get a nice snug fit not to tight but not loose." That sounds nice and easy, but what does it really mean?
Do you think the torque applied to the nut will be the same when those "instructions" are accomplished by a 200 lb football player, or a 110 lb long-blond haired gearhead cheerleader with long shapely legs in a very short skirt bending over the low Celica fender and
...wait, wait, that's a post for another forum...
And how about the tools used by the individuals. If the cheerleader uses a 3 ft breaker bar, and the football player uses his 6 inch tool, they may be applying the same torque when they both tighten to a "nice snug fit." You know, it's that whole Archimedes, "give me a lever long enough and a place to stand, and I will move the world" thing. Now if the tools are reversed, I would bet large sums the torque applied by the cheerleader will be much less than that applied by the football player when both report a snug fit. Using a torque wrench ensures both are applying the same torque; it permits a quantifying of the qualitative term "snug fit."
JHull, from reading your other posts it's obvious that you have the experience to put the valve cover on and tighten it correctly without the use of a torque wrench. But from reading many other posts, I also know there are many others out there that have very little experience...just look for posts where individuals have broken bolts from over tightening them.
So the real point I was making in my previous post was there IS a correct torque for the item that IS in the Toyota manual, and a 30 degree turn of the wrench past snug isn't it. If I was a mechanic that had to produce results quickly to make a larger profit, I'm sure I would not use a torque wrench for non-critical items either. But since I am working on my son's car with him, and I'm trying to teach him to follow tech guidance, I will continue to use a torque wrench since I have one. And that's all I have to say about that.