I do this for a living.. Heights have never bothered me..I was assigned to a tunnel job a few years ago... I lasted a few days.. just couldnt deal with being a few hundred feet underground..
Those wide flange beams are like runways till they shoot the studs.... then you need to tip toe to get around. I can tell the formwork isnt done oin that pic, and they are using the forms as access... yes more safety lines are needed
Also having a slack cable at your feet to tie off to is worth a fart in a high breeze..If you tie to that, your 6 foot lanyard that stretches to 7-8 feet when it unzips plus the slack you took out of the safety line during your fall you will be hanging below the girder...OSHA field day there LOL
Been there do that
this is me in the late 80's ontop of the Manhattan Bridge,
Ive made a career out of working on the bridges in NYC..