Making any comments about a patient - positive as well as negative - is now discouraged but 'this pleasant lady' is a standard medical letter opening and so lots of people do it from habit. It is pretty meaningless.
Some consultants never use it, some always use it and some vary according to what mood they were in when they wrote the letter and if they really thought you were pleasant or not.
Certainly when I see a patient who has been described as a 'pleasant lady' it doesn't really make me see the person any differently. I've seen complete nightmare patients another consultant has consistently called pleasant and incredibly delightful patients who have no 'pleasants' at all in there notes. It's just filler.
As said above 'denies' just means 'patient said they didn't have it'. So if I asked you 'do you have pain in your right leg?' and you said 'no' in the letter I would write 'Mrs Bloggs denies pain in her right leg'.
Finally loads of doctors actively discourage discussion about themselves. You need to have a boundary where you are the doctor and not their friend. I've had trouble in the past when patients knew I was getting married and bought me cards but a few weeks after I was trying to discharge them from the service - they thought we had more of a relationship so I couldn't discharge them but although I did like them, the same rules applied to them as someone obnoxious. As a rule your interaction with the doctor is very meaningful to you but it's likely that to the doctor it's quite clinical and you are one of hundreds.
So yes, if you have a consultation about your sex life, details of your sex life will be in the letter. But the doctor has probably heard about 1,000 people's sex lives and although you may find it embarrassing that it's in your notes, a doctor really isn't reading it like that (unless you've owned up to having sex with chickens in which case they have told everyone they know about the chicken fucker they saw in clinic today - but really it has to be very 'out there' to be shocking, they genuinely have heard and seen it all). And if you then saw another doctor about an ear problem, they will be skipping past anything not ear related in seconds as frankly clinic is very busy and they can't get distracted by irrelevant information.