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Wither: off-GCD, 170 potency, removes Protect. Aetheric Burst: off-GCD, 170 potency, debuff partly irrelevent. Energy Drain: off-GCD, 150 potency. Enkindle: off-GCD, 250 potency +80% with Rouse and Spur.
Wearing full i70 PvP gear with The Veil of Wiyu Zenith and the i70 PvP Fending ring yields these static damages when buffed with Raging Strikes (20 Seconds) and Mega-Potion of Intelligence NQ (15 seconds):
-Wither > consistently connects for 600-700 damage on a PvP i90 player, crits of around 800-1,000 damage.
-Aetheric Burst > consistently connects for 600-700 damage on a PvP i90 player, crits of around 800-1,000 damage
-Enkindle (Rouse + Spur) > consistently connects for around 900-1100 damage on a PvP i90 player, crits of around 1,400-1,700 damage
-Energy Drain > consistently connects for around 450-600 damage on a PvP i90 player, crits of around 700-900 damage
-Ruin II > about 350 damage, with crits as high as 550 on full i90 PvP players
So, in about two GCDs worth of "casts", you can do a minimum of around 3,300 damage to a player with an average HP pool of about 4,400. That's not even factoring the 4 other super-powered Energy Drains you get while still under the effects of Raging Strikes and the INT potion. Without a tank, this ensures that if your target is their healer, the healer will have no room to manage anyone but themselves, and will often be forced into Attunement very early on. If you have a tank stunning the healer with you while performing this burst, the healer must immediately Purify the stun, while still suffering from the severe latency of Purify, manage to Lustrate or Benediction before they die. If they don't, they will die every time.
The best SCH I've played with, who's full i90 with an HP pool of 5,500 has admitted that there is virtually nothing she can do to survive a well timed Stun with a properly executed SMN burst. Many of the best healers I've seen have taken to anticipating the burst and Attuning before they've been hit by anything, hoping to bait out PvP-only attacks and Enkindle.
You compared people complaining about your burst in PvE where enemies have enormous HP pools compared to a PC in i90. It wouldn't be wise to burst anything like that in PvE since it's a tremendous waste of resources, but if you can dish out lethal damage in a 5 second window on anyone in PvP, how is that not insane?