My answer is yes, you should use a baseline grid, but focus this on the most used style which is probably body text. Nobody will be forcing you to use it, its probably your choice, but some clients know about this and will specifically require you use it.
Body text is generally the main reason to use a baseline grid, especially when working with multiple columns of text. When working on 190 pages it is probably impossible (too time consuming) to align everything to the grid, as some titles with a larger font size/leading combo could need exceptions built into the style (baseline shifting or custom baseline). Also graphic elements, tables in particular, if needed, are tricky to align to the baseline grid.
What you can do is go to one of those media/press shops, like they have in airports, and look at some lifestyle magazines. See how they use the grid.
I have a copy of Monocle here (240 pages) and can tell you they do use a baseline grid, but not all text styles are aligned to it. Body text is always sticking to the grid, but other styles don't and they probably also use vertical justification in some cases to make it "look" like some text boxes (not body text) are aligned.