They didn't give him preferential treatment back then. And they certainly wont now especially with a British driver.
http://www.autosport.com/news/report.php/id/109990
Back then, McLaren were playing happy families. R.Dennis in particular was treating Hamilton like his own son.
In 2014, if they bring in a top line driver (who was previously fired), it would mean that they want to win at any cost. However, as I previously stated, I do not believe that McLaren have the ambition to win, under the current management. The win at all costs attitude simply isn't there right now - something which Hamilton perhaps, realised, which sparked his move out of the team.
Ferrari, Merc and RBR do have the win at all costs attitude, which is why they take risks in their designs (risk of getting banned). McLaren take less risks. The most recent example of risk taking and ambition is when Merc risked a huge fine, by carrying out a tyre test, after a disastrous Malaysian GP (I think it was the Malaysian GP). It was a calculated gamble, which paid off. McLaren would never have done something like that.
I think that partly the reason for this risk-averse attitude which McLaren currently have, is due to the huge fine they received in 2007. After that fine, I'm sure procedures were brought in to reduce the risk of getting caught out doing something, which they shouldn't. I partly understand this attitude. US$100M can bring most teams to their knees. Earlier this year, after Merc's illegal tyre test, Merc stated that if they get a huge fine, they may quit F1.
Anyway, I am hoping that Alonso stays at Ferrari for at least 2014, if only to see the inter-team battle between him and Kimi. We may see Alonso pushed to even greater heights.