I said I hold my own in the lane better, not hold flags better. WotS eliminates those frustrating scenarios where I'm hiding well behind my tower, waiting for my monk to slowly recharge my health (assuming its still alive and I'm not waiting for its replacement), wondering if its safe to venture out and risk getting spit on, sniped, chained, yellow denied etc etc.
I haven't played as a Blood Fire TB very much, find the concept rather boring so maybe that is a more effective way to go.... So far this seems better though... as long as I'm faster than my opponent or even as fast, I can count on WotS to charge me up and I'm back in the fight. Even if I don't use it to top off completely, as long as I use it say twice for 1000 each time, that should be more hp than an opposing TB is getting from Blood, even with added monk healing. The time I fought over a lane with a Blood Fire TB, his monk didn't last very long running in and out of my fire circles, but maybe I wasn't playing against good monk microers so we'll see if the monk healing is a bigger factor next time.
Sure aggressive players are scary... but thats why I'd only use WotS with a Queen, Oak... and TB. As TB, I have the speed, and I have the long range firepower to not get into those sketchy situations where I can't get away soon enough to use WotS. I'm not trading autoattacks with UB, I'm trading fireballs for spits... I back off a little, wait 10 seconds then engage again with full HP. Later on, I have Frost Nova II and III to help me safely use WotS right before Orb.