I won't be watching, however my Mum is travelling down from Rochdale for the weekend to soak up the atmosphere and enjoy the celebrations, she's been looking forward to it for weeks. There are 1000's like her too, going into London for the day, so if it brings pleasure and excitement to these people then surely its a good thing.
As for the tax burden issue, it doesn't stack up. Some people may find it hard to believe but there are a lot of people around the world (living in countries that don't have Royal Families), that are captivated by ours, and travel here in great numbers every year to visit the palace etc, whilst spending thousands in hotels, shops, restaurants. The money the Royal Family bring into the country outweighs the cost.