It's not true, runing ICS stock rom 4.0.4, and still same problem, at some people even with JB 4.1.2 - same problem, read bellow,
For some people this app helped,
i installed it, so we'll see.... I'm using ICS 4.0.4 last 3-4 months, never had problems with freezeing at activating WiFi, but at once before 1-2 days it started to freeze my phone when i enable WiFi... I don't know what could cause this problem, some people wrote updating many apps at once, or unistalling, or whatever, i have about 150-160 installed apps, so if number of apps is problem or some app, there can be reason in my case...
However bad bug my Samsung!