My family research is mainly based in Scotland. I tend to go to New Register House in Edinburgh for a day. It costs £15 to see any bmd certificate, will, census or parish register entry. If I'm well organised and have a plan of what I intend to search for, I can see several hundred certificates in a day. It does make a difference if you see the original certificates. You can find where a family lived at the time each child was born, see changes in occupations, pick up relationships through witnesses and informants etc.
For example, I made an assumption about the parents of a 4x great grandmother who died before civil registration, but could not prove it. I found the death certificate of someone who would have been a younger sister, if I was right. Found one of her sons staying with my family in a census where he was listed as a cousin, thus confirming the initial assumption. On another occasion I found someone described as blind on the 1911 census. On the birth certificate of his last child he signed with an X mark, although he had written a full signature before. That gave a date for his blindness. If you are after family history as well as genealogy, viewing certificates is invaluable.
Graham.