For me it depends on the situation. I'm of similar height (5' 11'') and it sounds like similar build but I've also had knee and shoulder surgery which has a big impact on me when I fly in Y.

For shorter flights it's not a problem (especially being UA silver which usually nets me free E+) but for longer flights (transcon and longer) the ever tightening pitch and shoulder room in Y just doesn't bode well for me (my knee gets stiff and swollen, my shoulder bumps into people, etc.). The others things are icing on the cake (free bag check if needed, lounge access on certain routes, food / drink, etc.)

Because of that I try my best to get up front through miles, cash, instruments, etc., and I find these days that through FCM you can usually find F fares for not much more than the Y fares is either at the time of booking or taking a TOD/FCM at check-in.

Obviously for international it's a little different but even there I've found opportunities to either get P fares, use miles/cash, or straight miles to get the extra room (or worst case snag a high quality E+/MCE/C+ seat).