Well...
As someone who generally plays with 90+ bugs on the table, I'd say nukes are about the same as before. A little less useful against the big bugs (which IMHO died far too easily before), but a LOT more useful against smaller bugs.
With the shortened tables, deployment zones are 2/3 the size that they were before, which means bugs are packed even tighter, AND (unless the rules have changed since the last time I looked) the nukes AoE doesn't take center points into account as before, which, for many bugs, adds about 1-3" to the radius, which equals A LOT more dead bugs.
Sure, the tanker can survive a nuke SOME of the time, but not all of the time. I never liked that the nuke was almost a game ender sometimes, but the nuke is certainly painful against horde armies now, where one good shot and an entire flank is wiped out!