I'm technically an ex-Paxil/Seroxat user, but not really-- I only took it for two days. The immediate side effects I got from it made it totally not worth it for me. It does help some folks a lot. Some folks can take it or leave it. And other folks, as I have so often read, got utterly f*cked up by it.
The withdrawal syndrome is not unique to Paxil. I've read that it has been known to occur with all the SSRIs. It also occurs with Effexor, an SNRI. My experiences with Effexor withdrawal (not a fun experience!) included many of the symptoms already mentioned (most especially the "brain zaps"), but less intense and for a longer period (weeks, in some people, months, even with weaning-off).
But is Effexor useful? You bet! All medications have risks, too. The emotional numbness mentioned IS definitely a major effect of antidepressants--that's one of the reasons they are useful. They clear away all the emotional junk and give you a chance to look at things in your life without them in the way. This effect can be taken too far, though, and is one of the reasons I don't take it anymore (I found my utter inability to be sad at a funeral or otherwise react with normal emotions to normally emotional things--the opposite of being overemotional--to be not-so-good.).