This is what's killing the Watch for me now.
I just got an S4 LTE and am very limited in what I can do without my phone nearby and connected. The main reason I got the LTE was to not have to bring my phone when I go for a run or bike ride, but without the phone only Apple's workout app can utilize GPS and data, and it's far from my top choice of app. So I still have to bring my phone with me, and I get to pay $10/month for the privilege.