Hen gaoxing you jian dao ni = 很高兴又见到你 = It is very glad to see you again.
In my opinion, '到' expresses a state which means 'have done' 'done' or 'have achieved'
'have got' 'have arrived', it can be combined with other words. For example, 学到, 来到, 听到, 看到, 找到。
In this case, it is 见到 which meas saw. Tense in Chinese is vague.