I'm a junior doctor myself and I expect to see general public response like this as you do not see half of the picture we see.
Re: Is pay increase gonna improve immediate patient care?
The answer is Yes.
Currently one doctor is doing at least two people's job, so each patient only gets half of the attention of a doctor so you can expect the doctor to be safe but by no means they can be thorough and treat all aspects properly. For example you come with stomach pain they probably investigate one or two main causes and let you go home and leave something like anemia untreated or don't even tell you about it.
A lot of doctors are doing sporadic shifts that is high paid but no continuity for patient care because the long term contract does not pay enough. If the pay is restored (35% increase is because there has been 26% paycut over the years) hopefully more doctors would remain in long term position then better continuity for patient care-so your doctor knows you and see you for more than once, would be able to provide care continously and not to risk making mistakes switching hands, and also be more efficient, eventually allow NHS to see more patients with the same amount of time.
UK trained junior doctors whenever they have means are all leaving to foreign countries for higher pay, if not doing sporadic shifts on a yearly basis in UK TO, just to make sure they can pay student debts after 6 years if medical school and not feel demoralised for the hard work they've put and the amount of sacrifice they've made to work in hospital-no social life, often poor health due to exposure to infections, shift pattern, and on top of that, constantly having to study and do exams in their spare time.
So if there's no pay-restoration you'll be less and less likely to be seen by a doctor when you're next in hospital. The NHS is aware of the shortage of junior doctors and over the years have made them stay longer in training by stopping them from progressing to senior level, and replacing them with less qualified nurse practitioners or physician assistants-who are already replacing a lot of work that used to be done by only doctors. Arguably that is a drop of standard in patient care. If you give birth in hospital and bled too much, or developed a complication, non doctors would not be able to spot it out for you-that could be difference of life and death.