How much time would you say you spend writing those tests? Maintaining them? Just capturing a complex UI interaction that you can verify at a glance in person

How much time would you say you spend writing those tests? Maintaining them? Just capturing a complex UI interaction that you can verify at a glance in person is next to impossible with the tools you mention. Unless they've made some serious progress in the last few months. For the issues I listed above, how many of them do you actually consider to be testable, using TDD's "write your tests first" definition of the word.