I can't say I'd noticed. Admittedly it's not trivial, in that I don't know of anywhere you can just show up with a credit card and buy a bitcoin, but it's hardly rocket surgery to fund a MtGox account.
That being said, they aren't the only option: other exchanges are cropping up, and bitcoin-otc is also available.
I started that process purely for the fun of some small-time speculation, but the whole hassle of the process made me realize why Bitcoin is important.