If the wording of a job ad determines whether you want the job or not, then you're doing it wrong. Here's the process I follow when looking for a job:
1. Choose a company that does something interesting and meaningful.
2. Try to understand what they are looking for, and if that's really what you want to do for 8+ hours every day.
3. Put everything on your resume that will maximize your chance to get the interview. This has nothing to do with your actual experience. Remember that you only need to be better than the rest of applicants, and usually it's not hard if you're good.
4. During the interview, evaluate the people. This is the most important step. These are the people who you will spent more time with than with your spouse, so choose carefully.
You can't get any idea about those people from the job ad, because they might not have even seen that ad. And even if they wrote it, phrases like "passion for what you do" mean different things for different people. Ultimately, yes, you should be somewhat passionate about what you do. If you're not, go to step 1.