This got a bit long so apologies for that, but here's my take on this. I think there is a conflation of issues (not just here and now but in general and in the numerous previous meta discussions)...
Questioner's Effort
A lack of effort or previous research isn't a reason to close a question and is the wrong thing to be focusing on (at least in the context of closure). I know a lot of people feel strongly about this and we've had the discussion a lot but as of now a lack of effort in and of itself isn't a reason to close a question. There are so many past meta discussions on this I'm not going to go in to that further for now.
Importantly though, there is actually no current close reason that covers a lack of effort. So closing a question for lack of effort alone means using a close reason that probably doesn't really apply. Which leads me to...
The "Too Broad" Close Reason
The reason for the "Too Broad" close reason is to limit the scope of the question. Essentially it is either for questions that are asking multiple distinct questions in one, or asking something that would take more work than is reasonable for the format to adequately answer. A lack of effort on the questioner's part may indicate a question is too broad; but the amount of effort itself, doesn't make it too broad.
This discussion may be relevant:
"Tutorial On Demand" Questions
The problem here is that "Tutorial" says nothing of scope or length. You can have a 50 word, 2 step tutorial that would take someone 5 minutes to write... or you can have a 2000 word, multi-technique recreation of a complex piece of work that would take someone days to write. These are obviously very different. The former would be on-topic, the latter too broad.
I think this is a very important distinction and the only one that makes sense in closing "Tutorial On Demand" questions.
For example...
How can I do X in Photoshop?
...is a perfectly acceptable question.
What decides whether it should be closed or not is what a reasonable and complete answer to that question would be. Would it be a 50 word description of a single technique, or would it need an essay explaining multiple steps and techniques.
So to take your example question...
I saw this and wondered how do I create this poster in Photoshop?
That question is too broad. There are at least a dozen different techniques used to create that poster (not even taking in to account composition, font choices, color etc.). Essentially you're either asking a dozen different questions in one, or you're asking for an essay. Note that the questioner's effort has nothing to do with it being too broad; if the question had stated and described in detail what they had researched and already done to recreate the text and the texture and the illustrations and the type layout etc. it would still be too broad.
Now, asking about any one of those techniques on their own would be fine. So...
I saw this and wondered how to recreate the text effect used on "CAPTAIN AMERICA"?"
...would probably be OK.
Likewise, the post that started this discussion was not too broad. It asked how to recreate a specific and relatively simple shape in Illustrator; the answer to which is simple enough.
So to reiterate...
A lack of effort in an of itself isn't a reason to close a question. It is of course a valid reason to downvote a question (it explicitly says so on the downvote button's title) and encouraging users to show effort and research (constructively) is an excellent idea (I think a further discussion on that would be good too, but that is for another question).
"Tutorial On Demand" questions are similarly not off-topic. They may be too broad, but shouldn't be closed as such unless they genuinely are (e.g. they're asking about multiple distinct techniques).
The "Too Broad" close reason should only be used if a question's scope means it can't reasonable be answered.
Food For Thought...
