Awesome survey :)
Just wanted to point out that given that this survey is about the existent tools and how important are they, instead of about the needs, and how much you need them satisfied, the importance statistic might be a bit misleading.
For example, if I would have a really great and easy way to start a beta deployment to test, or a very well polished deployment that finds any errors before they cause errors, maybe the CI would not be so important (as the need is to actually avoid bugs in prod).
Similar for code reviews and CI, a really good and well polished CI can do wonders to improve code reviews (and the other way around actually).
On the other side, if some tool is so not easy to use, or not fit for the purpose that you end up using a different tool to fill the need, that tool will lose importance to the replacement, even though it's the one meant to fit that need.
Point being that if all you have is a hammer, that hammer becomes extremely important even if what you are trying to do is to chop veggies (though your satisfaction would probably not be really high).