In March we had this massive iceberg of undetected cases, and thousands of Covid deaths being mis-categorised as Alzheimer's and Pneumonia etc. So the situation was vastly worse than the figures at the time made it look. Between 80 and 90% of the people who had it then were never ever tested but extrapolating back from the numbers of dead and hospitalised they think the peak was 100,000 new cases a day.
This time around the difficulty getting tests is artificially reducing the numbers of known cases, and the 28 day cut off plays down the deaths. However, just as in April and May the deaths still show as excess deaths (if they are over and above the expected number based on the last five years.
So this time, so far, the iceberg of undetected cases is quite a bit smaller.
This time, so far, it's doubling considerably slower than in March because of all the measures in place.
The doubling is the hallmark of exponential growth though, and sooner or later "the iron law of geometric progression" leads something quite slow and small looking to snowball into something huge and fast. (As we saw in April when suddenly 1200-1500 people were dying every day.)
At our current rate I think we'll be at that point again by Guy Fawkes night. (But measures can slow it down, absence of measures or non-compliance could speed it up) And if we allow things to get to that stage again there's not much that will help except a proper lockdown.
Finding the cases, testing contacts and isolating them properly would help enormously about now. 