It also seems to me that Gal's pretty smile and overall presence was 'male gaze' enough without having to resort to camera tricks lingering over certain parts of her anatomy.
You mean like this Michael Bay cheesecake from Transformers? When I saw this shot below I was shocked because I thought this kind of filmmaking went out with Baywatch but now we've got a big-budget Baywatch only the trailer for it seems to focus more on Zac Efron's sixpack than the girls. Equal-opportunity exploitation I guess.

have mixed feelings about the 'above average' Steve Trevor scene.
I like it because it's old-fashioned innuendo, which is kind of a lost art these days. Compare that humor to Drax on-the-nose penis joke in Guardians 2. Sexuality in movies has become way too direct and literal. I treat innuendo as approaching poetry. It's an art, albeit a juvenile one.
Having the setting be 100 years ago and a desire to keep the anachronisms to a minimum meant the characters could not talk and act the way they do today. As a result, Pine's Trevor is far more of a gentleman than, let's say, Pine's Kirk, who is basically the same wise-ass archetype as Star Lord.
She doesn't have to pretend to be a man to be strong and capable.
I think this film is in a no-win situation where people will always find offense with the characterization because Wonder Woman is such a powerful symbol. It's the same way with Superman and the whole Zod neck-snapping and "no one stays good in this world" attitude. How we want these two to behave is wrapped up in our own individual ideologies and moralities.
This film presents sort of a mathematical "average" between the extreme of the ultra-feminine sex symbol of Lynda Carter and the grim warrior archetype from Xena. That's why it's going to be such a magnet for critics since compromise in a polarized world winds up giving neither side all of what it wants.