Hi,
I've been pretty active on
ebay for the last 13 years, both buying and selling. My strategy (and apparently those of many others) is to find the item I want and put it on "watch". At about 1 minute before closing, I'll enter my highest bid on screen, hitting enter just once. This saves a step later, but does not get your bid in the system. At 5 or 6 seconds before closing, I'll hit "confirm", which does enter the bid. Often others are doing the same, so I have to be sure that my bid is the highest I want to pay for the item.
In my opinion, bidding well before closing only serves to drive up the price. That is great for the seller, but not for the buyer.