I went for the first time on Wednesday, overall the day was OK, park busy with school groups and families with kids. Queues however generally where shorter than advertised. Dragons Fury was listed as 45 mins when we joined, we got on in just under 20 mins, Vampire was similar. Kobra was advertised as 50 mins, took around 20 again. Monkey Swinger was advertised as 20 mins, took one cycle so only a few mins. Only queue that took longer than advertised was Croc Drop, posted as 30 mins, took close to 60.
The problem with a number of the rides was that due to small capacity cars, ie rattle snake, Fury and due to social distancing only loading one party per train, often cars going with only 1 or two passengers on them, further slowing what are already low capacity attractions. Managed 10 rides without particularly rushing around etc- Fury X 2, Vampire x 2, Rattlesnake X 1, Scorpion Express x 1, Croc Drop X 1, Tomb Blaster X 1, Kobra x 1 and Monkey Swinger x 1.
Glad I have now ticked the park off my list, prob won't return until the new coaster has opened though (if its good enough to warrant another trip. All though Alton (my local park) has its flaws, the quality of attraction is so much better than both Chessington and Thorpe, well accept food options.